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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.

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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