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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.

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Question No : 15
Harmful bacteria in drinking water cannot be destroyed by

chlorination
boiling
adding caustic soda
ozonisation

Question No : 16
Temporary hardness is due to the presence of

calcium carbonate
calcium bicarbonate
magnesium sulphate
calcium sulphate

Question No : 17
The gas used in balloons in the place of hydrogen is

nitrogen
helium
neon
argon

Question No : 18
Tincture iodine is a solution of

iodine in potassium iodide
iodine in alcohol
iodine in water
iodine in carbon disulphide

Question No : 19
Which of the following process involves removal of the elements of water?

Hydrolysis
Hydrogenation
Dehydration
Dehydrogenation

Question No : 20
Which of the following types of water gives lather easily with soap?

Hard water
Heavy water
Soft water
Both (a) and (b)

Question No : 21
Ozone occurs in the upper layers of air in the atmosphere because

it is lighter than air
in the lower layers it becomes unstable
ultra-violet light is present only in the upper layers
it mixes freely with O2 in the upper layers