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CHEMISTRY

Chemistry
Oxygen which is vital for life is a product of photosynthesis and comes from

Water
Carbon dioxide
Oxides of mineral elements
Carbonates from soil

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Chemistry
Which one of the following is a greenhouse gas ?

Helium
Nitrogen
Sulphur dioxide
Carbon dioxide

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Chemistry
Acid rain is caused by the pollution of environment by

Ozone and Carbon dioxide
Nitrous oxide and Sulphur dioxide
Carbon monoxide and Carbon dioxide
Carbon dioxide and Nitrogen

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Chemistry
The ‘Green House effect’ is produced due to the presence of excess amount of

Carbon monoxide
Methane
Sulphur dioxide
Nitrogen dioxide

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Chemistry
Which gas does not form the part of atmosphere ?

Nitrogen
Chlorine
None of these
Helium

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