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General Chemistry MCQ Question with Answer

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

Download General Chemistry MCQ Question Answer PDF

Question No : 22
The freezing point of water at 760 mm pressure is

273 K
0 K
273°C
-273°C

Question No : 23
Reduction involves

loss of electrons
gain of electrons
gain of oxygen
removal of hydrogen

Question No : 24
The presence of dust particles in air serves

as a nucleus to condense water vapour resulting in rain
to maintain the average density of air
to minimise the inflammatory nature of oxygen
to protect the inhabitants of the earth from the effects of ultra violet rays.

Question No : 25
Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the

Law of Multiple Proportions
Law of Definite Proportions
Law of Conservation of Mass
Law of Reciprocal Proportions

Question No : 26
The substance most abundantly found in sea water is

magnesium chloride
sodium chloride
calcium sulphate
potassium chloride

Question No : 27
The compounds produced by plants in the process of photosynthesis are

carbohydrates
proteins
salts
fats

Question No : 28
In the common soda-acid fire extinguisher, the fire is put out by

acid fumes
sodium bicarbonate
carbon dioxide
sodium carbonate