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Metals and Their Compound Metals and Their Compound Metals and Their Compound

Posted on August 21, 2025August 21, 2025 By admin

Metals and Their CompoundMetals and Their CompoundMetals and Their CompoundMetals and Their CompoundMetals and Their CompoundMetals and Their Compound

Metals and Their Compound

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Q.1. Why is it necessary to classify elements periodically?

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2. Consider the following statements:

  1. Metal and non-metal oxides are of different types.
  2. Metal oxides are basic but non-metal oxides are acidic.

Which of the above statement(s) is/are correct?

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3. Which one of the following is not correct?

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Q.4. In the outermost shell of a metal atom, usually how many electrons are present?

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Q.5. Consider the statements:

  1. Metals are electropositive.
  2. Metals can lose their valence electrons to form cations.
    Which statement(s) is/are correct?

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Q.6. Metals can be beaten into thin sheets with hammers. What is this property of metals called?

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Q.7. Which of the following pairs of metals are the most malleable?

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Q.8. Which one of the following statements is correct?

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Q.9. Which of the following metals has the lowest melting point?

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Q.10. Which of the following pairs of metals are found in liquid state at room temperature?

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Q.11. Which of the following statements is NOT correct?

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Q.12. Which of the following metals can be cut with a knife?

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Q.13. Which of the following metals has the lowest density?

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Q.14. Which of the following is an amphoteric oxide?

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Q.15. Consider the statements:

  1. Oxides of metals are acidic.
  2. Some oxides of metals are both acidic and basic (amphoteric).

Which statement(s) is/are correct?

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Q.16. Which of the following shows the correct order of reactivity of metals towards oxygen?

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Q.17. Sodium and Potassium are kept under kerosene or in a vacuum. Why?

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.18. Which metal is used in the construction of hot water tanks?

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Q.19. With which of the following acids does a metal not liberate hydrogen gas?

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20. Consider the statements:

  1. All ores are minerals.
  2. All minerals are not ores.
    Which statement(s) is/are correct?

 

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Q.21. What is the unwanted substance found in ores obtained from the Earth’s crust called?

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22. Smelting and roasting are processes by which:

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Q.23. Under which conditions is a mineral called an ore?

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Q.24. The elements that lose electrons to form cations are called:

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Q.25. Which of the following metals is classified as a strategic metal?

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Q.26. Which of the following metals does not have the property of ductility?

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Q.27. Which of the following metals will displace H₂ from dilute acids?

 

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Q.28. Which of the following statements regarding chemical properties of metals is NOT correct?

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Q.29. Consider the statements:

  1. Au, Ag, Pt, and Cu are found in nature in their free state because they are less reactive.
  2. K, Na, Ca, Mg are highly reactive, hence they cannot be found in free state.
  3. Moderately reactive metals like Al, Zn, Fe, Pb are mainly found in the Earth’s crust as oxides, sulfides, or carbonates.

Which statement(s) is/are correct?

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Q.30. What is the substance mixed with ore to remove impurities (gangue) called?

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Q.31. Which method is generally used for the enrichment of oxide ores?

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Q.32. The Bayer process is used for the concentration of which ore?

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Q.33. The process of strongly heating a sulfide ore in presence of sufficient air to convert the metal into its oxide is called:

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Q.34. The process of heating a metal oxide with coke to convert it into metal is called:

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Q.35. Consider the statements:

  1. Smelting is used to convert carbonate and hydrated oxide ores into pure oxides.
  2. Roasting is used to convert sulfide ores into pure oxides.

Which statement(s) is/are correct?

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36. Silver and gold are extracted by which method?

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37. Semiconductors like Germanium (Ge), Silicon (Si), Boron (B), Iridium (Ir) are refined by which method?

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Q.38. Leaching is used for which process in ores?

 

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Q.39. Which metal is obtained by treating its ore with a dilute solution of sodium cyanide?

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41. On which of the following metals does air have no effect?

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40. Which of the following metals cannot be obtained by reduction with carbon?

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42. Metals above hydrogen in the reactivity series:

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43. Food containers are coated with tin, not zinc, because:

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44. The ore whose particles are heavier than the impurities present in it is concentrated by which method?

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45. Which of the following metals can react with dilute nitric acid to liberate hydrogen gas?

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46. Which of the following shows the correct order of reactivity of metals?

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47. Which of the following metals forms amphoteric oxide?

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48. Which of the following metals does not react with cold or hot water?

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49. Ores in which the ore and impurities (gangue) have different chemical properties are concentrated by which method?

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50. Which of the following statements about roasting (भर्जन/जारण) is NOT correct?

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51. In which group and period of the periodic table is sodium (Na) located?

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52. Which alkali metals are found in abundance on the Earth's surface?

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53. Which alkali metal is the only one that combines with nitrogen to form a nitride?

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54. In Down's process:

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55. Why is calcium chloride mixed with sodium chloride before electrolysis?

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Q.56. Consider the following statements:

  1. Aqueous solution of sodium chloride is not used to obtain sodium metal.
  2. Sodium metal is mainly obtained by electrolysis of molten sodium chloride.

Which of the above statements is/are correct?

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57. The chemical formula of common salt is:

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58. When common salt (NaCl) is obtained from seawater, which impurity is usually present?

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59. When common salt is left exposed to air, it becomes damp. The reason is:

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60. What is added to common salt to make it iodized?

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61. Which sodium compound is mixed with ice to prepare a freezing mixture?

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62. Which important compounds are prepared commercially by the Castner-Kellner method?

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63. Which important sodium compounds are prepared by the Ammonia-soda (Solvay) process?

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65. What is the chemical formula of sodium thiosulfate?

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66. In which form is sodium bicarbonate used?

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67. In kitchens, which is commonly used to make tender dishes or to cook food quickly?

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69. Which is used to make bread or cake soft and spongy?

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70. How much sodium is present in a healthy human body?

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71. When pieces of sodium are placed in water:

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73. In photography, the chemical commonly used as “hypo” is:

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74. Municipalities commonly use yellow lamps to illuminate streets. Which element is used in these yellow lamps?

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75. In photography, sodium thiosulfate (hypo) is useful in which way?

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76. What is the chemical name of Chile saltpeter?

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77. Which compound is used to purify air in submarines, ships, and hospitals?

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78. When sodium bicarbonate is heated, which gas is released that makes bread and cake soft and spongy?

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79. Eno’s salt, which helps reduce stomach acidity, is a mixture of:

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80. What is the chemical formula of Soda Ash?

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81. Which of the following is NOT an ore of magnesium?

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82. Magnesium is mainly extracted from which ore?

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83. Which compound of magnesium is used for making the lining of furnaces?

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84. Which of the following metals burns in nitrogen to form a nitride?

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85. Which metal is used for making flash-light ribbons?

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86. Which of the following is used to reduce stomach acidity or as an antacid?

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87. Consider the following statements:

  1. Magnesium oxide is called Milk of Magnesia.
  2. Magnesium hydroxide is called Magnesia.

Which of the above statements is/are correct?

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88. Epsom salt chemical formula is—

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89. The organic compound chlorophyll, which gives green color to plants, contains which metal?

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90. The main metallic component present in Sorel cement is —

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91. Which is the most abundant metal available in the Earth’s crust?

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92. In 1827, aluminium metal was first extracted from which substance, though it was very expensive?

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93. After iron, which metal is most widely used?

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94. Who discovered the cheap method of aluminium extraction, due to which the price of aluminium dropped by about 90%?

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95. Which of the following is an ore of aluminium?

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96. What is the primary ore of aluminium from which aluminium is extracted?

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97. The impurities (gangue) present in bauxite are removed by which method?

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98. What is the main gangue found along with bauxite ore?

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99. What is the chemical name of bauxite?

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100. Aluminium metal is extracted from bauxite by which method?

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101. Aluminium metal is extracted by the electrolysis of alumina (Al₂O₃), but what difficulty arises in its extraction?

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102. Why is cryolite (Na₃AlF₆) added in the electrolysis of alumina?

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103. Why are cryolite (Na₃AlF₆) and a little fluorspar (CaF₂) mixed in the electrolysis of alumina?

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104. When alumina is electrolyzed, pure aluminium is obtained at:

 

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105. Which method is used to remove impurities from bauxite ore?

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106. Which of the following is an ore of aluminium?

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107. Although aluminium is more abundant in the Earth's crust than iron, why is aluminium more expensive?

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108. Which of the following statements about aluminium is NOT correct?

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109. Which metal and its alloys are used for making airplanes and rockets?

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110. Which method is used to remove impurities from aluminium obtained by the electrolysis of alumina?

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111. Which compound is used to make fire-resistant and water-repellent fabrics?

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112. What is the chemical formula of common alum (Potash Alum)?

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113. Ruby (माणिक्य) और Sapphire (नीलम) are oxides of which element?

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114. Which aluminium salt is commonly used to stop bleeding (as a styptic)?

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115. How does Potash Alum stop bleeding?

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116. Which aluminium salt is used for purifying dirty water?

 

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117. Which of the following is an alkali soil metal?

 

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118. Lime stone, marble, chalk, etc. are chemically what?

 

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119. What is the chemical name of Quick-lime and Slaked-lime?

 

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120. Consider the following statements:

  1. Calcium oxide is called quick lime.
  2. Calcium hydroxide is called slaked lime.

Which of the above statements is/are correct?

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121. When limestone (CaCO₃) is heated, it produces:

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122. Which compound is used for whitewashing houses?

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123. Limestone is:

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124. What is the chemical formula of Plaster of Paris?

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125. Consider the following statements:

  1. If gypsum is heated above 393 K, it becomes completely anhydrous, forming calcium sulfate.
  2. If gypsum is carefully heated up to 393 K, Plaster of Paris is formed.

Which statement(s) is/are correct?

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126. In surgery, which is used in the form of casts to set and join broken bones?

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127. Which calcium compound is widely used for making statues?

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Which of the following statements about Plaster of Paris (POP) is NOT correct?

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129. When an aqueous solution of sodium carbonate is added to an aqueous solution of calcium chloride or calcium nitrate, a white precipitate is obtained. What is it?

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130.How much calcium is present in the body of an average human?

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131. Approximately 99% of the total calcium present in the body is found in –

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132.Which of the following is not correct?

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133. What is the main ore of calcium from which calcium metal is extracted?

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134.Hydrolith and Nitrolith are compounds of which metal?

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135.What is the chemical formula of dolomite?

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136 What is calcium phosphate used for?

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137.Which of the following statements about calcium oxide (CaO) is not correct?

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138.On a commercial scale, bleaching powder is prepared by—

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139.By Hoesen-Klever or Böhme plant, which important substance is prepared?

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140.Consider the following statements about bleaching powder:

  1. Bleaching powder is a yellowish-white powder that has the smell of chlorine gas.
  2. Chemically, bleaching powder is calcium oxychloride.
  3. When bleaching powder is left open in air, it slowly releases chlorine gas.

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141.When bleaching powder is left exposed to air, it loses its effectiveness because –

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142.Bleaching powder is used for –

 

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145.Which of the following is called lime chloride?

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145.Which statement about bleaching powder is false?

 

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146.In the extraction of calcium metal, calcium fluoride is added to calcium chloride because –

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147.Asbestos is made of –

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148.Which of the following statements about iron (Fe) is not correct?

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149.Which is the most important iron ore from which iron is extracted?

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150.From which of the following minerals is iron not extracted?(FeS₂)

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151.Which is the main gangue mixed in the iron ore hematite?

 

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152.Hematite is chemically-

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153.From hematite ore, the gangue is removed by which method?

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154.Regarding the blast furnace used in iron extraction, which one is not correct?

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156.Before putting into the blast furnace, hematite ore is mixed with coke and limestone. What is this mixture called?

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157.Which flux is used to remove gangue from hematite ore?

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158.Consider the following statements:

  1. In the blast furnace used for iron extraction, the lower part contains the reducing agent carbon monoxide.
  2. The uppermost part of the blast furnace contains the reducing agent carbon.

Which of the statements is/are correct?

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159.The iron obtained from a blast furnace is—

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160.Which of the following is not true?

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161. By which method is wrought iron obtained from pig iron?

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162. What is the percentage of carbon in wrought iron?

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163. In obtaining iron from hematite, in what form is limestone used?

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165. Consider the following statements:

  1. In white cast iron, most of the carbon is present in a combined form.
  2. In grey cast iron, most of the carbon is distributed in the form of fine graphite flakes throughout the mass.

Which of the above statements is/are correct?

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164. In a blast furnace, by which substance is iron oxide reduced?

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166. Which of the following is Green Vitriol?

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167. Which of the following is called Fool’s Gold?

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168. Which compound of iron is used to stop bleeding from a cut?

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169. What is the chemical formula of Mohr’s Salt?

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171. Pyrolusite is the ore of which metal?

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170. Excess of which metal in the body causes the disease called Siderosis?

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172. The deep purple compound used as an antiseptic and disinfectant is:

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173. Which compound is known as “Red Medicine”?

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174. Which of the following is NOT correct about copper?

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176. Which of the following is a copper sulfide ore?

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175. Which two metals are NOT silver-colored?

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177. In the extraction of copper from non-sulfide ores, which is used as a reducing agent?

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178. Extraction of copper from sulfide ores, i.e., copper pyrites, is difficult. Why?

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179. Consider the following statements:

  1. A mixture of Cu₂S and FeS is called Copper Matte.
  2. Copper Matte contains about 70% copper.
  3. Copper from Copper Matte is obtained by the Bessemerization process.

Which of the above statements is/are correct?

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180. From very low-grade ores containing extremely small amounts of copper, which method is used for extraction?

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181. Copper metal is used in:

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182. Consider the following statements:

  1. Copper does not react with dilute HCl and dilute H₂SO₄.
  2. Copper reacts with concentrated HCl and concentrated H₂SO₄.

Which of the above statements is/are correct?

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183. When anhydrous copper sulfate is added to water, the color of the water becomes:

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184. Which of the following copper compounds is used as a disinfectant?

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185. Which compound is known as Blue Vitriol or Blue Stone?

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186. Which disease occurs when the copper content in the human body increases?

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187. Which chemical is used to destroy algae in water tanks?

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188. Which element is the enemy of copper?

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189. The chemical formula of “Tritiya” is:

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190. Which metal is used for making calorimeters and lightning conductors?

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191. Which of the following is NOT an ore of zinc?

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192. From which two major ores is zinc extracted?

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193. What is the approximate zinc content in snake venom 🐍 ?

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194. The phosphorus used in making ointments, creams, etc., is chemically:

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196. To protect wooden objects from insects, which compound is applied on them?

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197. Which of the following compounds exhibits phosphorescence?

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198. The chemical formula of White Vitriol is:

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199. What is the mixture of zinc sulfide (ZnS) and barium sulfate (BaSO₄) called?

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200. Which of the following is used as a rodenticide (rat poison)?

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201. The substance used in dyeing as a mordant is:

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202. The metal that reacts with hot sodium hydroxide solution to produce hydrogen gas is:

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203. Which of the following is an ore of silver?

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204. Silver and gold are extracted by:

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205. In the leaching process for extracting silver and gold, which of the following is used?

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206. Calaverite and Sylvanite are ores of which metal?

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208. Which metal is called “White Gold” and “Adam’s Catalyst”?

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209. The cyanide process is used for extracting which metal?

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210. Silver is mainly extracted from which ore?

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212. Silver nitrate is usually stored in colored bottles. Why?

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211. Which compound is used to mark a voter’s finger during voting?

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213. Which of the following compounds decomposes in sunlight?

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214. It is advised not to eat eggs with a silver spoon. Why?

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215. Which of the following metals is found in the free (native) state?

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216. Which metal is called the “King of Metals”?

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217. Consider the following statements:

  1. Gold and silver are found in nature in the free (native) state.
  2. Gold and silver are not found in combined (ore) form in nature.

Which of the statements is/are correct?

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218. Which compound is used in making anti-venom syringes?

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219. Which of the following statements is NOT correct?

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220. Which of the following metals is obtained by reacting its ore with an aqueous solution of sodium cyanide?

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221. 100% pure gold is:

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222. What is added to gold to make it harder?

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223. Hallmark signs are applied on which products?

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224. What is the percentage of pure gold in 18-carat gold alloy?

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225. Which of the following metals has the highest density?

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226. Gold and silver are used in making jewelry due to which property?

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227. Which of the following metals remains in liquid state at ordinary temperature?

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228. Mercury is extracted from which ore?

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229. Which of the following metals is neither malleable nor ductile?

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230. Which of the following statements is NOT correct?

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233. Which metal is commonly used in thermometers and barometers?

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234. Mercury is commonly used in thermometers because of which property?

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235. Which gas is filled in a normal tubular light (fluorescent tube)?

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236. Which chemical, used in medicines as “Makar Dhwaj,” has the following chemical formula?

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238. Mercury combines with other metals to form a metallic solution, which is called:

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237. Chemically, what is Sindoor?

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240. Mercury is stored in a container made of which metal?

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239. Which of the following metal combinations is an amalgam?

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241. Which of the following mercury compounds is used as a disinfectant?

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242. Which is the most stable element?

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243. Which of the following is a non-metal that conducts heat and electricity?

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244. Lead is extracted from which ore?

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245. Lithiarge has which nature?

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246. Which lead compound is used in the manufacture of storage batteries?

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247. Which of the following compounds is called “Sugar of Lead” or “Inorganic Sugar”?

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248. Which of the following metals is used for writing on paper?

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249. Lead pipes are not used for drinking water because:

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250. Which metal is used in storage (rechargeable) batteries?

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251. What is the chemical name of Galena?

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252. In vehicles, which metal pollutes the air due to the burning of petrol?

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253. Which of the following is a radioactive metal?

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254. Which radioactive element is abundantly found in the monazite sand along the Kerala coast in India?

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255. Which of the following is called a “Hope Metal”?

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257. Which of the following isotopes of uranium does NOT exhibit radioactivity?

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258. Which isotope of uranium is used as fuel in nuclear reactors?

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259. Consider the following statements:

  1. Natural uranium contains 0.7% of U-235.
  2. Enriched uranium contains 2–3% of U-235.

Which of the above statements is/are correct?

 

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260. The substance called “Yellowcake” that is smuggled across borders is:

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261. On 6 August 1945, the “Little Boy” atomic bomb dropped on Hiroshima (Japan) by the USA used which element?

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262. On 9 August 1945, the “Fat Man” atomic bomb dropped on Nagasaki (Japan) by the USA used which element?

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263. Which element acts as fuel in a nuclear reactor?

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264. Which element was first artificially produced?

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265. Who discovered the new element Plutonium (atomic number 94)?

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266. Which of the following is the heaviest metal?

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268. What is the chemical symbol of Tungsten?

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269. Which of the following metals cannot be easily cut with a knife?

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270. Which element is used as a timekeeper in atomic clocks?

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271. During fireworks, the green color is seen due to the chloride salt of which element?

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272. In fireworks, the bright red color is due to the chloride salt of which element?

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273. Among the following metal combinations, which contains the lightest and the heaviest metal?

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274. Which element is used in making rechargeable batteries for mobile phones and laptops?

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275. Which element is used in the manufacture of transistors, solar panels, and microprocessors?

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276. Which of the following metals is as strong as steel but weighs only half as much?

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277. Who discovered the radioactive elements Radium and Polonium?

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278. Which of the following elements is used in the manufacture of fertilizers?

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279. Which chemical substance is coated on audio and video tapes?

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280. What is the percentage of lead in a lead pencil?

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281. Which of the following elements exhibits unique magnetic properties at room temperature?

271 / 360

282. The filament of an electric bulb is made of:

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283. Which of the following substances is very hard and highly tensile?

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284. Consider the following statements:

  1. “Degana” in Rajasthan is famous for uranium production.
  2. “Jadugoda” in Jharkhand is famous for tungsten production.

Which of the above statements is/are correct?

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285. Identify the metal which is chemically inert in nature.

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286. Which of the following is in liquid form at room temperature?

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287. Who discovered Potassium?

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288. Which of the following is not a component of chlorophyll?

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289. The most chemically inert metal pollutant from automobile exhaust is:

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290. Which of the following compounds is commonly used in mouthwashes and toothpastes?

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291. Which of the following metals is used for making electric wires?

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292. Which of the following compounds is known as “Red Liquor”?

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293. The Ellingham Diagram is used to determine:

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294. In the aluminothermic process, aluminum acts as:

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295. Which substance is used for drying gases?

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296. Which alkali metal has the lowest melting point?

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297. K₂CO₃ (Potassium carbonate) is not prepared by the Solvay process because:

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298. Which of the following metals is used in fireworks to produce bright white light?

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299. Which of the following statements is correct?

289 / 360

300. KMnO₄ (Potassium permanganate) is used in which of the following forms?

290 / 360

301. Regarding corrosion, which of the following is NOT correct?

291 / 360

302. Consider the following statements:

  1. Corrosion causes deterioration of metals.
  2. Sometimes corrosion can also be beneficial for metals.

Which of the above statements is/are correct?

292 / 360

303. When a piece of iron is exposed to moist air for a few days, a brown layer forms on its surface. What is it called?

293 / 360

304. For the rusting of iron, the presence of which is essential?

294 / 360

305. Consider the following statements:

  1. Both oxygen and moisture are essential for the rusting of iron.
  2. The hydrated form of iron(III) oxide is called rust.
  3. The amount of water in iron oxide keeps varying, so rust is represented as Fe₂O₃·xH₂O.

Which of the above statements is/are correct?

295 / 360

306. When copper is exposed to moist air for a long time, a green layer forms on its surface. What is it called?

296 / 360

307. The green layer formed on the surface of copper when exposed to moist air is chemically:

297 / 360

308. Rust formed on iron is chemically:

298 / 360

309. The green layer (patina) on copper can be removed with the help of:

299 / 360

310. When a silver item is exposed to air for a long time, its surface becomes black. The reason is:

300 / 360

311. The black layer formed on silver when it corrodes is called:

301 / 360

312. When silver items are exposed to air for a long time, their surface becomes tarnished due to:

302 / 360

313. Which of the following is NOT correct?

303 / 360

314. Due to rusting, the weight of iron:

304 / 360

315. On which of the following metals does the oxide layer act as a protective layer?

305 / 360

316. Coating the surface of a metal with tin, nickel, chromium, copper, etc., to prevent its corrosion is called:

306 / 360

317. Coating iron with zinc to prevent corrosion is called:

307 / 360

318. Coating aluminum with an oxide layer to prevent corrosion is called:

308 / 360

319. By which of the following methods can corrosion of metals be prevented?

309 / 360

321. Paint applied on the surface of iron prevents rusting because it:

310 / 360

322. The pure form of iron is called:

311 / 360

323. Galvanising iron prevents its corrosion because:

312 / 360

324. Which of the following minerals does not contain oxygen?

313 / 360

325. Which of the following statements is NOT correct?

314 / 360

326. A homogeneous mixture of two or more metals, or a metal and a non-metal, is called:

315 / 360

327. Consider the following statements:

  1. If an alloy contains mercury, it is called an amalgam.
  2. The electrical conductivity of an alloy is less than that of pure metals or constituent metals.
  3. Sometimes the melting point of an alloy is lower than that of its constituent metals.

Which of the above statements are correct?

316 / 360

328. Which of the following statements is correct?

317 / 360

329. The malleability and ductility of an alloy, compared to its constituent metals, are:

318 / 360

330. The melting point and electrical conductivity of an alloy, compared to its constituent metals, are:

319 / 360

331. Consider the following statements:

  1. Converting metals into alloys increases their strength and quality.
  2. Alloys are corrosion-resistant.

Which of the above statements is correct?

320 / 360

332. Which of the following is not an alloy?

321 / 360

333. Steel is mainly an alloy of:

322 / 360

334. Consider the following statements:

  1. The carbon content in steel lies between wrought iron and pig iron.
  2. The carbon percentage in steel is 0.10–1.5%.

Which of the above statements is correct?

323 / 360

335. Steel is produced by:

324 / 360

336. Consider the following statements:

  1. Pig iron is converted to steel by the cementation process.
  2. Steel is made from wrought iron by the Bessemer process.
  3. Nowadays, high-quality steel is mostly produced from wrought iron using the Linz-Donawitz process.

Which of the above statements is correct?

325 / 360

337. Which of the following is the most modern method of producing steel from iron?

326 / 360

338. Which of the following statements is correct?

327 / 360

339. Hard steel is heated to 1123 K and then plunged into cold water to make it even harder. What is this process called?

328 / 360

340. If quenched steel is heated and then cooled slowly, it becomes more ductile and less brittle. What is this process called?

329 / 360

341. Heating steel to a red-hot temperature and then cooling it slowly to make it soft is called:

330 / 360

342. Which of the following steels is extremely hard and strong?

331 / 360

343. Helmets and rock crushing machinery are made from which type of steel?

332 / 360

344. What is the percentage of manganese in manganese steel?

333 / 360

345. Which steel is used in transformers and electromagnets?

334 / 360

346. Which steel is acid-resistant and is used to make pumps and pipes for transporting acids?

335 / 360

347. A permanent magnet is made from which material?

336 / 360

348. Permanent magnets are made from which type of steel?

337 / 360

349. To make stainless steel, which important metal is added with iron?

338 / 360

350. Which important metals are used to make stainless steel?

339 / 360

351. Parts of airplanes, motor cars, and bicycles are made from which steel?

340 / 360

352. What is added to steel to increase its hardness?

341 / 360

353. Which steel is used to make high-speed machines and drilling tools?

342 / 360

354. Consider the following statements:

  1. If steel contains 46% nickel, it is used to make scientific instruments and equipment.
  2. If steel contains 36% nickel, it is used to make lamp bulbs and radio valves.

Which of the above statements is correct?

343 / 360

355. Which alloy is used for making weighing scales, light equipment, and similar items?

344 / 360

356. Which is a very strong and highly corrosion-resistant alloy “Bronze”?

345 / 360

357. The alloy ‘Brass’ used for making utensils, screws, nuts, and bolts is –

346 / 360

358. Which elements are included in stainless steel?

347 / 360

359. Which alloy is used for making heating elements in electrical appliances?

348 / 360

360. “German Silver” used in making utensils is an alloy of:

349 / 360

361. Rolled Gold is an alloy of:

350 / 360

362. Which element is not present in German Silver?

351 / 360

363. Which of the following is not a proper alloy?

 

352 / 360

364. Which of the following is not a proper alloy?

353 / 360

365. Gun metal is an alloy of –

354 / 360

368. An alloy containing 90% Copper and 10% Tin is –

355 / 360

366. Manganin, used in making electrical instruments, is an alloy of –

356 / 360

369. By which of the following processes does a metal become stronger?

 

357 / 360

370. Which of the following statements is correct?

 

358 / 360

371. The solder used in electronics, pipeline metal sheets, and electric wire welding is an alloy of –

359 / 360

372. In the alloy Duralumin (used in pressure cookers and aircraft structures), along with aluminium and copper, which other metals are present in small amounts?

360 / 360

373. Consider the following statements –

  1. Muntz metal and Dutch metal are alloys of copper and zinc.
  2. Muntz metal contains 80% copper and 20% zinc.
  3. Dutch metal contains 60% copper and 40% zinc.

Which of the above statements is/are correct?

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