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Chemistry

Chemistry
Which one of the following is most electronegative

Carbon
Lead
Tin
Silicon

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Chemistry
Malathion is a/an

Pesticide
Preservative
Insecticide
Fumigant

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Chemistry
For generation of biogas, the materials commonly used are

Aquatic plants
Animal wastes
Forest residues
Crop residues

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Chemistry
The chief source of naphthalene is

Camphor
Diesel
Coal-tar
Charcoal

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Chemistry
Diamond is lustrous because

It is colourless
It is hard
Its refractive index is high
It is pure

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Chemistry
The lowest layer of earth's atmosphere is

Mesosphere
Stratosphere
Ionosphere
Troposphere

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