300+ TOP MCQs on Redox Reaction and Answers

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MCQs on Redox Reaction :

1. Which of the compounds can exist together?
(A) HgCl₂, SnCl₂
(B) FeCl₃, KI
(C) FeCl₃, SnCl₂
(D) FeCl₂, SnCl₂

Answer

Answer: (d)

2. One mole of ferrous oxalate requires____ moles of MnO₄^– to get oxidised completely in an acidic medium
(A) 0.6 moles
(B) 0.4 moles
(C) 0.2 moles
(D) 7.5 moles

Answer

Answer: (b)

3. H₂O₂ changes Cr₂O₇^2- ion to CrO₅ in an acidic medium, the oxidation state of Cr in CrO₅ is
(A) +6
(B) +5
(C) -10
(D) +3

Answer

Answer: (a)

4. H₂SO₄ acts as a strong oxidising agent. In which of the reaction, is it not acting as an oxidising agent?
(A) C + 2H₂SO₄ → CO₂ + 2SO₂ + 2H₂O
(B) CaF₂ + 2H₂SO₄ → CaSO₄ + 2HF
(C) S + 2H₂SO₄ → 3SO₂ + H₂O
(D) Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O

Answer

Answer: (b)

5. During a reaction of oxalic acid, potassium chlorate and sulphuric acid, the oxidation number of which of the element undergoes a maximum change
(A) H
(B) S
(C) C
(D) Cl

Answer

Answer: (d)

6. Find the redox reaction
(A) In the atmosphere, O₃ from O₂ by lighting
(B) The reaction of H₂SO₄ with NaOH
(C) Both oxidation and reduction reaction
(D) Evaporation of water

Answer

Answer: (c)

7. Find the oxidation state of I in H₄IO₆^–
(A) +7
(B) +5
(C) +1
(D) -1

Answer

Answer: (a)

8. In which of the following complex, the oxidation number of Fe is +1?
(A) Fe₄[Fe(CN)₆]₃
(B) [Fe(H₂O)₅NO]SO₄
(C) [FeBr₄]^–
(D) [Fe(H₂O)₆]^2-

Answer

Answer: (b)

9. Which among the following compounds is the most reducing compound?
(A) H₂S
(B) HNO₂
(C) SnCl₂
(D) H₂SO₃

Answer

Answer: (a)

10. Which among the following is the strongest oxidising agent?
(A) H₂O₂
(B) O₃
(C) K₂Cr₂O₇
(D) KMnO₄

Answer

Answer: (b)