300+ TOP MCQs on Redox Reaction and Method for Balancing Redox Reaction and Answers

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MCQs on Redox Reaction and Method for Balancing Redox Reaction :

1. Which of the following represents a redox reaction?
(A) NaOH + HCl → NaCl + H₂O
(B) BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl
(C) CuSO₄ + 2H₂O → Cu(OH)₂ + H₂SO₃
(D) Zn + 2HCl → ZnCl₂ + H₂

Answer

Answer: (d)

2. Which reaction involves neither oxidation nor reduction?
(A) CrO₄^2- -→ Cr₂O₇^2-
(B) Cr → CrCl₃
(C) Na → Na⁺
(D) 2S₂O₃^2- → S₄O₆^2-

Answer

Answer: (a)

3. Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because
(A) Zn acts as an oxidising agent when it reacts with HNO₃
(B) HNO₃ is a weaker acid than H₂SO₄ and HCl
(C) In electrochemical series, Zn is above hydrogen
(D) NO₃^– is reduced in preference to hydronium ion

Answer

Answer: (d)

4. A compound of Xe and F is found to have 53.5% of Xe. What is the oxidation number of Xe in this compound?
(A) -4
(B) 0
(C) +4
(D) +6

Answer

Answer: (d)

5. A solution contains Fe²⁺, Fe³⁺ and I^– ions. This solution was treated with iodine at 35^oC. E^o for Fe³⁺/Fe²⁺ is 0.77V and E^o for I₂/2I^– = 0.536V. The favourable redox reaction is
(A) I₂ will be reduced to I^–
(B) there will be no redox reaction
(C) I^– will be oxidised to I₂
(D) Fe²⁺ will be oxidised to Fe³⁺

Answer

Answer: (c)

6. One mole of N₂H₄ loses 10 moles of electrons to form a new compound y. Assuming that all nitrogen appears in the new compound, what is the oxidation state of nitrogen in y.
(A) -1
(B) -3
(C) +3
(D) +5

Answer

Answer: (c)

7. The equivalent mass of oxidising agent in the following reaction is

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

Answer

Answer: (c)

8. In the reaction

3Br₂ + 6CO₃^2- + 3H₂O → 5Br^– + BrO₃^– + 6HCO₃^–
(A) bromine is oxidised and carbonate is reduced
(B) bromine is reduced and water is oxidised
(C) bromine is neither reduced nor oxidised
(D) bromine is both reduced and oxidised

Answer

Answer: (d)

9. Which of the following cannot function as an oxidising agent?
(A) I^–
(B) Si(s)
(C) NO₃^–(aq)
(D) Cr₂O₇^2-

Answer

Answer: (a)

10. The oxidation number of Pt in [Pt(C₂H₄)Cl₃]^– is
(A) +1
(B) +2
(C) +3
(D) +4

Answer

Answer: (b)