300+ TOP MCQs on Auto Oxidation and Disproportionation and Answers

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MCQs on Auto Oxidation and Disproportionation :

1. Which one of the following will not reduce an acidified solution of potassium dichromate (VI)?
(A) (CH₃)₂C(OH)CH₃
(B) FeSO₄
(C) CH₃CH₂CH(OH)CH₃
(D) Zn

Answer

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
(A) 1:1
(B) 1:2
(C) 1:3
(D) 2:3

Answer

Answer: (a)

3. Which of the following has been arranged in order of decreasing average oxidation number of sulphur?
(A) H₂S₂O₇ > Na₂S₄O₆ > Na₂S₂O₃ > S₈
(B) SO₂⁺ > SO₄^2- > SO₃^2- > HSO₄^–
(C) H₂SO₅ > H₂SO₃ > SCl₂ > H₂S
(D) H₂SO₄ > SO₂ > H₂S > H₂S₂O₈

Answer

Answer: (c)

4. The decomposition of KClO₃ to KCl and O₂ on heating is an example of
(A) intermolecular redox change
(B) intramolecular redox change
(C) disproportionation or auto redox change
(D) none of these

Answer

Answer: (b)

5. Disproportionation means
(A) only oxidation
(B) only reduction
(C) both, oxidation and reduction of a reactant
(D) neither oxidation nor reduction

Answer

Answer: (c)

6. The compounds behaving both oxidizing, as well as a reducing agent, is
(A) H₂O₂
(B) SO₂
(C) HNO₂
(D) HNO₃

Answer

Answer: (a,b,c)

7. A substance which can be oxidised as well as reduced easily is
(A) HCl
(B) HClO
(C) HClO₃
(D) HClO₄

Answer

Answer: (b,c)

8. Equivalent mass of oxidising agent in the reaction

SO₂ + 2H₂S → 3S + 2H₂O
(A) 32
(B) 64
(C) 16
(D) 8

Answer

Answer: (c)

9. The oxidation number of iron in Fe₃O₄ is
(A) +2
(B) +3
(C) 8/3
(D) ⅔

Answer

Answer: (a,b)

10. Oxidation numbers of chlorine in Cl₂O, Cl₂ and ClO₃^– are respectively
(A) +1, -1, +5
(B) +1, 0, -1
(C) -1, 0, +1
(D) +1, 0, +5

Answer

Answer: (d)