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Chemistry

Chemistry
DDT and BHC may act as

Asthematic agents
Carcinogens
None of these
Allergens

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Chemistry
The lightest gas which is non-inflammable is

Hydrogen
Nitrogen
Oxygen
Helium

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Chemistry
Which one of the following is extensively used for sterilizing water ?

Bleaching powder
Borax powder
Soda powder
Alum

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Chemistry
24 carat of diamond is equal to

95% mg
200 mg
200 g
91% gold

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Chemistry
Maximum permissible concentration of total hardness in drinking water is

500
200
50
100

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Chemistry
The chemical bahaviour of an atom depends upon

The number of electrons orbiting around the nucleus
The number of neutrons in the nucleus
The number of protons in its nucleus
The number of nucleons in the nucleus

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