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CHEMISTRY

Chemistry
Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?

Chlorofluorocarbon
Sulphur dioxide
Nitrous oxide
Carbon dioxide

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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
Greenhouse effect is caused by

Carbon dioxide
Nitrogen dioxide
Carbon monoxide
Nitrogen

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Chemistry
The lowest layer of earth's atmosphere is

Mesosphere
Stratosphere
Ionosphere
Troposphere

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Chemistry
Earth’s atmosphere is an envelope of gases extending to a height of

100 km
150 km
300 km
200 km

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