NCERT Class11 Redox Reactions Pdf Chemistry MCQs,Practice Test,quiz

Redox Reaction Mock Test-1

In the reaction 2H2S+SO2 → 3S+2H2O

(a) H2S has been oxidized
(b) SO2 has been oxidized
(c) H2S is the oxidizing agent
(d) SO2 is the oxidizing agent

Questions No:2
In the reaction MnO2 + 4HCl → MnCl2 + CI2 + 2H2O, which species is oxidized?

(a) HCl is oxidized to Cl2
(b) MnO2 is oxidized to MnCl2
(c) HCl is oxidized to H2O
(d) None of these

Questions No:3
Combination of phosphorus and oxygen is an example of

(a) oxidation
(b) reduction
(c) rancidity
(d) None of these

Questions No:4
Which of the following is a redox reaction?

(a) Evaporation of H2O
(b) Both oxidation and reduction
(c) H2SO4 and NaOH

Questions No:5
(d) In atmosphere O3 from O2 by lighting

Which of the following is not an example of redox reaction?

(a) 2PbO + C→ 2Pb+CO2
(b) Fe2O3 + 3CO → 2Fe +3CO2
(c) 2K+ F2 → 2KF
(d) AgNO3 + NaCl → AgCl + NaNO2

Questions No:6
Match the columns:
Column I

(A) Addition of oxygen
(B) Removal of electropositive element
(C) Removal of hydrogen
(D) Addition of electronegative element

(I) Oxidation reaction
(II) Reduction reaction



Questions No:7
Match the columns:

A)2Mg(s)+O2(g) → 2MgO(s)
B)2H2S(g)+O2 → 2S(s)+2H2O(l)
C)2FeCl3(aq)+H2(g) →2FeCl2(aq)+2HCl(aq)
D)2HgCl2(aq)+SnCl2(aq) → Hg2Cl2(s) +SnCl4(aq)

Column II
(I) removal of hydrogen
(II) addition of oxygen
(Ill) addition of electropositive element
(IV) removal of electronegative element


Questions No:8
Consider the following statement:
(A)2Fe2Cl2 (aq) + H2(g) → 2FeCl2 (aq) + 2HCl(aq) is a redox reaction.
(B) BaCl2 + H2SO4 → BaSO4 + 2HCl is not a redox reaction.
Select the correct option:

(a) A is true. B is false
(b) Both A and B are false
(c) A is false B Is true
(d) Both A and B are true

Questions No:9
Reduction is a gain of

(a) electrons
(b) protons
(c) neutrons
(d) oxygen

Questions No:10
Loss of electrons is found in

(a) oxidation
(b) reduction
(c) redox reaction
(d) All of the above

Questions No:11
Oxidation reduction reaction involves

(a) transfer of neutrons
(b) transfer of protons
(c) transfer of electrons
(d) None of the above

Questions No:12
It one half of an equation shows oxidation and remaining hall reflects reduction, then we call them:

(a) half equation
(b) oxidation equation
(c) reduction equation
(d) redox equation

Questions No:13
In the reaction Br2 + 2I-1→ 2Br-1+I2, the oxidizing agent is


Questions No:14
Which of the following is/are TRUE regarding oxidation/reduction reactions?
I. Oxidation Involves the gain of electrons
II. Electrons are transferred from one substance to another
III. The number of electrons lost/gained must be equal

(a) I only
(b) II only
(c) III only
(d) II and Ill.

Questions No:15
Electrons are lost by the

(a) reducing agent as it undergoes oxidation.
(b) reducing agent as it undergoes reduction
(c) oxidizing agent as it undergoes oxidation.
(d) oxidizing agent as it undergoes reduction.