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Chemistry

Chemistry
Basicity of boric acid, H3BO3 is

3
2
5
4

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Chemistry
Nitrogen fixation is a process of

Utilisation of nitrogen gas
Conversion of molecular nitrogen to ammonia
Conversion of organic nitrogen to proteins
Assimilation of nitrate

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Chemistry
Ozone layer is present in

Stratosphere
Troposphere
Ionosphere
Exosphere

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Chemistry
Which one of the following is a major green house gas?

Carbon monoxide
Chloro fluorocarbon
Carbon dioxide
Freon

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Chemistry
The gas used for artificial fruit ripening of green fruit is

Methane
Ethylene
Ethane
Acetylene

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Chemistry
Diamond is lustrous because

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

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