General Science MCQ – 156 (Chemistry)

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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

2. 25.4g of iodine and 14.2g of chlorine are 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

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

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 the above

5. Disproportionation means?
(A) Only oxidation
(B) Only reduction
(C) Both oxidation and reduction of a reactant
(D) Neither reduction nor oxidation

6. The compounds behaving both oxidizing, as well as a reducing agent is?
(A) H₂O₂
(B) SO₂
(C) HNO₂
(D) All of the above

7. A substance that can be oxidized as well as reduced easily is?
(A) HCl
(B) HClO
(C) HClO₃
(D) Both B and C

8. Equivalent mass of oxidizing agent in the reaction: SO₂ + 2H₂S → 3S + 2H₂O?
(A) 32
(B) 64
(C) 16
(D) 8

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

General Science MCQ – 155 (Biology)