MCQs on Auto Oxidation and Disproportionation

MCQs on Auto Oxidation and Disproportionation

1. Which one of the following will not reduce an acidified solution of potassium dichromate (VI)?

1. (CH₃)₂C(OH)CH₃
2. FeSO₄
3. CH₃CH₂CH(OH)CH₃
4. Zn

Answer: (a)

2. 25.4g of iodine and 14.2g of chlorine is made to react completely to yield a mixture of ICl and ICl₃. Calculate the ratio of moles of ICl and ICl₃

1. 1:1
2. 1:2
3. 1:3
4. 2:3

Answer: (a)

3. Which of the following has been arranged in order of decreasing average oxidation number of sulphur?

1. H₂S₂O₇ > Na₂S₄O₆ > Na₂S₂O₃ > S₈
2. SO₂⁺ > SO₄^2- > SO₃^2- > HSO₄^–
3. H₂SO₅ > H₂SO₃ > SCl₂ > H₂S
4. H₂SO₄ > SO₂ > H₂S > H₂S₂O₈

Answer: (c)

4. The decomposition of KClO₃ to KCl and O₂ on heating is an example of

1. intermolecular redox change
2. intramolecular redox change
3. disproportionation or auto redox change
4. none of these

Answer: (b)

5. Disproportionation means

1. only oxidation
2. only reduction
3. both, oxidation and reduction of a reactant
4. neither oxidation nor reduction

Answer: (c)

6. The compounds behaving both oxidizing, as well as a reducing agent, is

1. H₂O₂
2. SO₂
3. HNO₂
4. HNO₃

Answer: (a,b,c)

7. A substance which can be oxidised as well as reduced easily is

1. HCl
2. HClO
3. HClO₃
4. HClO₄

Answer: (b,c)

8. Equivalent mass of oxidising agent in the reaction

SO₂ + 2H₂S → 3S + 2H₂O

1. 32
2. 64
3. 16
4. 8

Answer: (c)

9. The oxidation number of iron in Fe₃O₄ is

1. +2
2. +3
3. 8/3
4. ⅔

Answer: (a, b)

10. Oxidation numbers of chlorine in Cl₂O, Cl₂ and ClO₃^– are respectively

1. +1, -1, +5
2. +1, 0, -1
3. -1, 0, +1
4. +1, 0, +5

Answer: (d)