Oxidation and ReductionOxidation and ReductionOxidation and ReductionOxidation and ReductionOxidation and ReductionOxidation and ReductionOxidation and ReductionOxidation and ReductionOxidation and ReductionOxidation and Reduction

1. Oxidation is a chemical reaction in which:
   

2.Reduction is a chemical reaction in which:

Consider the following statements:

1. During oxidation, the proportion of electropositive groups increases.
2. During reduction, the proportion of electronegative groups decreases.

Which of the above statements is/are correct?

4.What is the tendency to lose electrons called?

5.During oxidation, the proportion of electronegative groups:

Consider the following statements:

1. In oxidation, there is a loss of electrons.
2. In reduction, there is a gain of electrons.

Which of the above statements is/are correct?

What type of reaction is the following?
2Cu+O2​→2CuO

8.In oxidation:

1. Hydrogen is displaced from a substance.
2. The proportion of electropositive elements in a substance increases.

Use the code given below to choose the correct answer:

Code:

10. In any chemical reaction, oxidation and reduction:

"Which of the following is a redox reaction?"

12.Consider the following statements:

1.The burning of hydrogen is an oxidation reaction.

2.Combustion is an oxidation process.

Which of the above statements is/are correct?

13.An oxidizing agent is a substance that –

14.“An oxidizing agent is a substance that—

14.An oxidizing agent is a substance that –

“15. Which of the following is an oxidizing agent?

“16. Which of the following is an oxidizing agent?

“17. Which of the following is not an oxidizing agent?

“18. Which of the following is not a redox reaction?

“19. Consider the following reaction:
CH₄ + 2O₂ → CO₂ + 2H₂O

Which of the following statements is correct?

1. Carbon is reduced.
2. Carbon is oxidized.
3. Hydrogen is reduced.
4. Hydrogen is oxidized.

Codes:

20. Which of the following is an oxidation reaction?

“21. The conversion of ferrous chloride (FeCl₂) into ferric chloride (FeCl₃) is—

“22. The conversion of Fe²⁺ into Fe³⁺ is a process of—

23. Rusting of iron is an example of—

24. The strongest oxidizing agent is—

“25. A reducing agent is a substance which—

“26. A reducing agent is a substance which—

1. In a given substance, increases the oxidation number of the element.
2. In a given substance, decreases the oxidation number of the element.
3. Gets oxidized itself in a redox reaction.
4. Accepts electrons in a redox reaction.

Choose the correct answer using the codes below:

“27. Which of the following is a reducing agent?

“28. Which of the following is a reducing agent?

“29. Which of the following is not a reducing agent?

“30. The conversion of CO to CO₂ is—

“31. In the reaction ZnO + C → Zn + CO₂, carbon is acting as—

“32. In the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, which substance is being oxidized?

“33. In the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂, which is the reducing agent?

“34. In the reaction 3Fe + 4H₂O → Fe₃O₄ + 4H₂, which is the oxidizing agent?

“35. Regarding the following reaction, which statement is false?

2PbO + C → 2Pb + CO₂

1. Lead is being reduced.
2. Carbon dioxide is being oxidized.
3. Carbon is being oxidized.
4. Lead oxide is being reduced.

36. Which of the following is an example of a redox reaction?

“37. Which of the following reducing agents can also act as an oxidizing agent?

“38. Which of the following acts as both an oxidizing and a reducing agent?

“39. Which of the following substances can act as both an oxidizing and a reducing agent?

“40. Which of the following behaves both as an oxidizing and a reducing agent?

“41. What is the oxidation state of Mn in K₂MnO₄?

“42. What is the oxidation number of Mn in KMnO₄?

43. “What are the oxidation states of the elements in KMnO₄: Potassium (K), Manganese (Mn), and Oxygen (O) respectively?

44. What is the oxidation state of Cr in K₂Cr₂O₇?

43. What are the oxidation states of the elements in KMnO₄: Potassium (K), Manganese (Mn), and Oxygen (O) respectively?

44. What is the oxidation state of Cr in K₂Cr₂O₇?

“45. What is the oxidation number of sulfur in Na₂S₂O₅?

“46. What is the oxidation state of sulfur in Na₂SO₄?

“47. In which of the following molecules is the oxidation state of carbon positive?

“48. What is the oxidation state of iron (Fe) in [Fe(CN)₄]²⁻?

“49. What is the oxidation number of nickel (Ni) in K₄[Ni(CN)₄]?

“50. What is the oxidation state of carbon in oxalic acid (H₂C₂O₄)? 

“51. Among the following chemical elements, which element has the same oxidation state in all its compounds?

“53. Oxygen has a positive (+ve) oxidation number only in—

“53. What is the oxidation number of oxygen in OF₂?

“54. In OF₂, the oxidation numbers of fluorine and oxygen are respectively—

“55. In which of the following does oxygen have the highest oxidation number?

57. When H₂SO₃ changes into H₂SO₄, then the oxidation number of sulfur (S) will change from:

58.When Br₂ changes into BrO₃⁻, the oxidation number of bromine (Br) changes from:

59.In CaOCl₂ (Calcium Oxychloride / Bleaching powder), the oxidation number of chlorine (Cl) is:

60.In Ni(CO)₄ (Nickel tetracarbonyl), the oxidation number of Nickel (Ni) is:

61.In a glucose molecule (C₆H₁₂O₆), the oxidation number of carbon will be:

62.In [Co(CN)₆]³⁻, what is the oxidation number of cobalt (Co)?

63.Among the following, in which compound does nitrogen have the highest oxidation number?

64.In which of the following compounds does phosphorus have an oxidation number of +3?

65.If the ion Z⁺ loses two electrons in a reaction, what will be its oxidation number?

66.When a metal ion M⁺ loses two electrons, what will be the oxidation number of the metal?

67. In which of the following compounds does chlorine have an oxidation state of +1?

68.In which of the following does chlorine have an oxidation state of +1?

69. Which of the following is an example of an oxidation-reduction (redox) reaction?

The oxidation state of carbon in C₃O₂ and Mg₂C₃ is:

71.In an acidic medium, during the reaction of potassium permanganate with ferrous ammonium sulfate, the oxidation state of manganese in potassium permanganate changes from:

72.Which of the following oxidation numbers is not exhibited by nitrogen?

71. In an acidic medium, during the reaction of potassium permanganate with ferrous ammonium sulfate, the oxidation state of manganese in potassium permanganate changes from:

73.The maximum oxidation number exhibited by carbon is:

74.When a copper rod is dipped in silver nitrate solution, the color of the solution changes to blue. This happens because:

75. In the reaction H₂ + I₂ → 2HI, which species is getting oxidized?

76.Which of the following statements related to oxidation and reduction are correct?

1. In oxidation, electrons are lost, whereas in reduction, electrons are gained.
2. An oxidizing agent decreases the oxidation number, but a reducing agent increases the oxidation number.
3. In oxidation, electrons are gained, whereas in reduction, electrons are lost.
4. An oxidizing agent increases the oxidation number, but a reducing agent decreases the oxidation number.

Choose the correct answer from the code given below:

Consider the following statements:

1. Non-metals tend to gain electrons, therefore they act as oxidizing agents.
2. Metals tend to lose electrons, therefore they act as reducing agents.

Which of the above statements is/are correct?

78.What is the process called in which electropositive elements combine?

79.The process of combining with electronegative elements or groups is called:

Rusting of iron is an example of:

Reactions in which the same substance undergoes both oxidation and reduction are called: