Oxidizing and Reducing Agent MCQs

There are two important terms to understand: oxidizing agent (or oxidant) and reducing agent (or reductant). An oxidizing agent causes another species to be oxidized by itself undergoing reduction. Electron donors are known as reducing agents, while electron acceptors are known as oxidizing agents. Major electron donors include organic fuels, such as glucose. In cellular respiration, oxygen acts as the final electron acceptor or oxidizing agent. The reducing agent or reductant undergoes oxidation, and the oxidizing agent or oxidant undergoes reduction. The oxidizing or reducing capacity of an agent is equal to the number of electrons involved in its reduction or oxidation.

Which of the following statements is not correct?

(a) oxygen is neutral to litmus
(b) oxygen is not combustible
(c) oxygen supports combustion
(d) oxygen is a powerful oxidising agent

Oxygen can be converted into ozone by

(a) oxidation at high temperature
(b) catalytic oxidation
(c) oxidation under high pressure and temperature
(d) silent electric discharge

Oxidation is also referred to as

(a) combustion only
(b) respiration only
(c) transpiration
(d) combustion and respiration

The violet colour of acidified KMnO4 is decolourised by H2O2. In this reaction H2O2 acts as an

(a) oxidising agent
(b) reducing agent
(c) oxidising as well as reducing agent
(d) none of the above

Hydrogen acts as a reducing agent by

(a) taking oxygen only
(b) giving electron only
(c) taking hydrogen
(d) taking oxygen and giving electrons

Oxidising agents do not include

(a) potassium iodide
(b) potassium manganate
(c) potassium dichromate
(d) bromine solutions

The oxides of which of the following are neutral in nature?

(a) hydrogen
(b) halogens
(c) alkali metals
(d) all the above

In the copper oxide (CuO) and carbon monoxide (CO) reaction, the reducing agent is

(a) CuO
(b) CO
(c) Cu
(d) CO2

Why is potassium iodide (KI) a potent reducing agent?

(a) iodide is oxidised to iodine
(b) iodine is reduced to iodide ion
(c) iodide ion is reduced to iodine
(d) iodine is oxidized to iodide ion

Hydrogen peroxide is used as an

(a) oxidising agent
(b) reducing agent
(c) bleaching agent
(d) all are correct