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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)

  1. 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)

  1. H2O2 changes Cr2O72- 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)

  1. 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)

  1. 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)

  1. 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)

  1. Find the oxidation state of I in H4IO6

(a) +7

(b) +5

(c) +1

(d) -1

Answer: (a)

  1. 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)

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

(a) H2S

(b) HNO2

(c) SnCl2

(d) H2SO3

Answer: (a)

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

(a) H2O2

(b) O3

(c) K2Cr2O7

(d) KMnO4

Answer: (b)


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