General Chemistry MCQ - Multiple Choice Question and Answer

General Chemistry MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 1
Which of the following is not a chemical change?

Rusting of iron

Burning of magnesium

Sublimation of iodine

Electrolysis of water

Question No : 2
Which of the following is not a physical change?

Distillation of water

Action of heat on potassium chlorate

Powdering of glass

Burning of an electric lamp

Question No : 3
The atomic number of an element represents

number of neutrons in the nucleus

number of protons and neutrons in the nucleus

the valency of the element

number of protons in the nucleus

Question No : 4
Which of the following statements regarding natural radioactivity is true?

It is spontaneous disintegration of atoms

It is induced by bombardment with projectiles

It is transmutation of atoms with projectiles

It is dependent on temperature

Question No : 5
Gases have

a definite shape but not volume

a definite volume and shape

a definite volume but not shape

neither definite volume nor shape

Question No : 6
The most abundant constituent in air is

hydrogen

nitrogen

oxygen

noble gases

Question No : 7
Ethyl alcohol is

a deliquescent substance

an efflorescent substance

a hygroscopic substance

a dehydrating substance