Chemistry MCQs

Question 1

Which of the following is used as a lubricant in heavy machines?

Accepted Answer

Graphite

Answer

Bauxite

Answer

Sulphur

Answer

Phosphorus

Question 2

Which of the following is used in making smoke bombs?

Accepted Answer

Carbon

Answer

Sulphur

Answer

Phosphorus

Answer

Hydrogen

Question 3

Water gas is the mixture of

Accepted Answer

Carbon monoxide and hydrogen

Answer

Carbon dioxide and hydrogen

Answer

Carbon monoxide and nitrogen

Answer

Carbon dioxide and nitrogen

Question 4

In electro-refining, the pure metal is deposited on

Accepted Answer

Cathode

Answer

Vessel

Answer

Electrolyte

Answer

Anode

Question 5

Which of the following electrodes is used in strongly alkaline solution?

Accepted Answer

Mercury - mercuric oxide electrode

Answer

Mercury - mercurous sulphate electrode

Answer

Mercury - mercurous chloride electrode

Answer

Silver - silver chloride electrode

Question 6

The laws of electrolysis are given by

Accepted Answer

Faraday

Answer

Ostwald

Answer

Arrhenius

Answer

Lewis

Question 7

Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives

Accepted Answer

Copper at cathode and oxygen at anode

Answer

Copper at anode and oxygen at cathode.

Answer

Copper at cathode and anodes dissolve to give copper

Answer

Hydrogen at cathode and oxygen at anode

Question 8

Aluminium can be purified by

Accepted Answer

Electrolysis

Answer

Oxidation

Answer

Distillation

Answer

Ozonolysis

Question 9

The aqueous solution of potassium chloride is

Accepted Answer

A strong electrolyte

Answer

A weak electrolyte

Answer

A non-electrolyte

Answer

Initially weak and then become a strong electrolyte