Acid, Base and Salt Acid, Base and Salt Acid, Base and Salt

1. A solution of an acidic substance

Consider the following statements:

1. Acids do not always exhibit acidic properties.
2. The presence of water is essential for acids to show their acidic properties.

Which of the above statements is correct?

3. Which ion is released when slaked lime (calcium oxide/hydroxide)  Ca(OH)₂ dissolves in water?

4. Which ion is released when an acid dissolves in water?

5. Aqueous solution of slaked lime (Ca(OH)₂) –

6. What is the neutral color of litmus?

7. Consider the following statements:

1. Acids and bases can be identified by litmus paper, but their strength cannot be determined.
2. Acids and bases can be identified by a universal indicator, and their strength can also be determined.

Which of the above statements is correct?

8. Choose the correct statements from the following:

1. Litmus paper is used to test acids and bases.
2. Salts are formed as a result of the reaction between an acid and a base.
3. An acid is a substance that accepts protons, and a base is a substance that donates protons.

Code:

9.A solution reacts with powdered eggshell and produces a gas that turns limewater milky. Which of the following is present in the solution?

9.A solution reacts with powdered eggshell and produces a gas that turns limewater milky. Which of the following is present in the solution?

10. Bases turn red litmus paper blue, and acids turn blue litmus paper red. A student tested a liquid with red litmus paper, and it remained red without any change. This indicates that the liquid:

11. Acids taste –

12. Bases taste –

13. Which of the following is an oxyacid (hydroacid)?

14. Which of the following is an oxyacid?

15. "Hydrogen is an essential component of all acids." Who first stated this?

16. Which of the following statements are correct?

1. Acids are sour in taste and give H⁺ ions.
2. Acids are sour in taste and give OH⁻ ions.
3. Bases are bitter in taste and give OH⁻ ions.

17. According to the Brønsted–Lowry concept:

1. Acids are proton donors.
2. Acids are proton acceptors.
3. Bases are proton donors.
4. Bases are proton acceptors.

18. An acid is a substance which –

19. A base is a substance which –

20. Which of the following is an acid?

21. Which of the following is not a base?

22. What is a base that is soluble in water called?

23. Consider the following statements:

1. All bases are alkalis, but not all alkalis are bases.
2. All alkalis are bases, but not all bases are alkalis.

Which of the above statements is correct?

24. Hydrochloric acid is stronger than acetic acid because –

25. Acetic acid is a weak acid because –

26. When soap solution is added to the purple extract made from beetroot, the color changes to –

27. Sodium hydroxide is stronger than ammonium hydroxide because –

28. Which of the following aqueous solutions conducts electricity?

29. All salts are –

31. The word “Acid” originates from the Latin word –

30. Which of the following aqueous solutions are electrolytes?

32. The word “Alkali” originated from –

33. Which acid is present in apples?

36. Antacids are –

37. Antacids are commonly used to get relief from stomach acidity. Which of the following substance is used?

38. Nettle is a herbaceous plant. Which acid is released from the stinging hairs on its leaves?

40. Tannic acid is present in –

41. Which acid is present in soda beverages?

43. Which of the following properties is correct for a toothpaste?

45. According to Arrhenius, an acid in aqueous solution increases –

44. Among the following, which will provide the highest amount of hydrogen ions (H⁺)?

46. If you suspect that a plant is not growing in a pot due to soil acidity, which substance would you add to the soil?

47.When a few drops of lemon are squeezed into tea, its color gradually changes because –

49.Aqueous solution turns red litmus paper blue. Which of the following should be added in greater quantity to make the solution turn blue litmus paper red?

50. What is the nature of an aqueous solution of sodium sulfate?Na₂SO₄

51. Consider the following statements:

1. Oxides of metals are basic in nature.
2. Oxides of non-metals are acidic in nature.

Which of the above statements is correct?

52. Which of the following is a basic oxide?

53. Which of the following is an acidic oxide?

55. Regarding litmus paper, which of the following is NOT correct?

56. Which of the following is NOT an olfactory (smell-based) indicator for identifying acids and bases?

57. Which of the following solutions is NOT capable of identifying acids and bases?

58. Which of the following is a synthetic indicator?

59. Suppose you have four test tubes labeled A, B, C, and D.

• A contains plain water
• B contains a basic (alkaline) solution
• C contains an acidic solution
• D contains a sodium chloride solution

Which of these solutions will turn a phenolphthalein solution pink?

60. In a strong acidic solution, the color of methyl orange indicator is –

61. The number that indicates the acidity or alkalinity of a substance is called –

64. Consider the following statements:

1. The pH of an acidic solution is less than 7.
2. The pH of a basic (alkaline) solution is greater than 7.
3. The pH of a neutral solution is 7.

Which of the above statements is correct?

65. Which of the following solutions will have a pH value less than 7?

67. What is the pH of pure water at 25°C?

66. Which of the following substances will have the highest pH in aqueous solution?

68. Neutral water with pH ≈ 7 becomes slightly acidic when mixed with air. Why?

69. To neutralize the sour taste of lemon, which of the following would be most effective?

70. Which of the following solutions is strongly acidic?

71. A solution turns red litmus paper blue. Its probable pH is –

72. In the human buccal cavity, below which pH value does tooth decay begin?

73. The pH of an antacid is definitely –

74. Three solutions A, B, and C have pH values of 4, 1, and 11 respectively. In which solution is the hydrogen ion concentration the highest?

75. Who developed the pH scale?

77. The pH of fresh milk is ____. When milk turns sour or becomes curd, the pH –

76. What is the hydrogen ion concentration in pure water?

78. What is the pH of pure water?

79. What is the nature of an aqueous solution of ammonia (NH₃)?

80. Which instrument is used to test the acidity of an aqueous solution?

81. The aqueous solution of ammonium chloride (NH₄Cl) is – 

82. The pH value of human blood is:

83. What is the nature of human blood?

84. Which of the following statements is NOT correct?

85. The pH value of milk is:

86. The pH of the human body is:

87. In an acidic solution, the concentration of H⁺ ions will be:

88. If the pH of an aqueous solution is 3, what is its pOH?

"Consider the following: In an aqueous solution, the concentration of hydrogen ions can be determined by –

1. By pH
2. By pOH
3. By pKa
4. By pKw

Which of the above is/are correct?"

90. Continuous use of calcium superphosphate as a fertilizer in soil will make the soil pH:

92. Which of the following has the lowest pH?

93. Which of the following has the most alkaline pH?

94. pH measurement indicates:

95. When the pH of a solution decreases, the H⁺ ion concentration in the solution:

96. A solution of HCl and aqueous NaOH in test tubes can be distinguished by:

97. The pH of human sweat is:

98. The pH of human tears is:

99. What color does water give with a universal indicator?

100. Neem twig cleans teeth because the juice of neem twig is:

101. Which of the following metals reacts with HCl or NaOH solution to liberate hydrogen gas?

102. Sodium bicarbonate reacts with dilute HCl to produce a gas. This gas is:

103. When CO₂ gas is passed through slaked lime (Ca(OH)₂), it turns milky. On passing excess gas, it becomes:

104. Metal oxides react with dilute acids to form water and:

105. NH₄Cl reacts with NaOH to produce a gas. This gas is:

106. Metal carbonates react with dilute mineral acids to produce which gas?

107. Which of the following substances will NOT produce CO₂ gas when reacted with aqueous HCl?

108. Which of the following statements is correct?

1. AlCl₃ is a Lewis acid.
2. According to Lewis, acids are substances that accept an electron pair.

Codes:

109. Acids react with metals to produce which gas?

110. In which of the following reactions will CO₂ gas NOT be produced?

111. How is concentrated sulfuric acid diluted?

112. A salt is formed by:

113. A common salt is made by:

114. Which of the following is NOT a property of salts?

115. When certain salts are added to water, bubbles are formed. The reason is:

116. Which of the following is a basic salt?

117. Which of the following is not a normal salt?

118. Which of the following salts, when left exposed to air, lose water of crystallization?

119. Salts that are free from acidic hydrogen atoms or hydroxyl ions are called:

120. Which of the following is a deliquescent salt?

121. What type of salt is Mohr's salt?

122. Which of the following is a complex salt?

123. Which of the following salts does not contain water of crystallization?

125. 10 mL of NaOH solution completely neutralizes 8 mL of HCl solution. How much of the same HCl solution is required to neutralize 20 mL of the same NaOH solution?

126. Consider the following statements:

1. The pH of a buffer solution does not change significantly on addition of acid or base.
2. Human blood is an example of a buffer solution.

Which of the above statements is/are correct?