Redox Reaction MCQs

A redox reaction, also known as an oxidation-reduction reaction, involves the transfer of electrons between two species. Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. There are three main types of redox reactions: combustion, disproportionation, and single replacement. Redox reactions are extensively used in various industries, such as pharmaceutical, metallurgical, and agricultural sectors.

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

Which among the following is the strongest oxidising agent?

(a) H₂O₂
(b) O₃
(c) K₂Cr₂O₇
(d) KMnO₄

Which of the compounds can exist together?

(a) HgCl₂, SnCl₂
(b) FeCl₃, KI
(c) FeCl₃, SnCl₂
(d) FeCl₂, SnCl₂

Which among the following compounds is the most reducing compound?

(a) H₂S
(b) HNO₂
(c) SnCl₂
(d) H₂SO₃

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

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^–

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

Find the oxidation state of I in H₄IO₆^–

(a) +7
(b) +5
(c) +1
(d) -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

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