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Chemistry

Chemistry
DDT and BHC may act as

None of these
Allergens
Asthematic agents
Carcinogens

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Chemistry
In upper layer of atmosphere ozone is formed by

The action of ultraviolet rays on oxygen
Subjecting oxygen to high pressure
The combination of oxygen molecules
The action of nitrogen on oxygen in atmosphere

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Chemistry
KMnO4 can be used as a/an

Disinfectant
Insecticide
Fertiliser
Pesticide

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Chemistry
The process of removing calcium and magnesium from hard water is known as

Water softening
Flocculation
Sedimentation
Filtration

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Chemistry
The substance which does not expand on going from liquid state to solid state is

Type metal
Aluminium
Cast-iron
Water

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Chemistry
If a buffer solution is diluted its pH

Remains same
Will slowly increase and then it will decrease
Is increased
Is decreased

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MORE MCQ ON Chemistry

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