MCQs on Redox Reaction

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: (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: (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: (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: (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: (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: (c)

7. Find the oxidation state of I in H₄IO₆^–

(a) +7

(b) +5

(c) +1

(d) -1

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: (b)

9. Which among the following compounds is the most reducing compound?

(a) H₂S

(b) HNO₂

(c) SnCl₂

(d) H₂SO₃

Answer: (a)

10. Which among the following is the strongest oxidising agent?

(a) H₂O₂

(b) O₃

(c) K₂Cr₂O₇

(d) KMnO₄

Answer: (b)