The main constituent in air is _______.

oxygen

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nitrogen

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carbon dioxide

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sulphur dioxide

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Solution

The correct option is B nitrogen
Air is a mixture of many gases, dust particles and water vapour. Nitrogen is the major constituent of air making up nearly 78% of it.

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The main constituent of biogas is

(a) methane
(b) carbon dioxide
(c) hydrogen
(d) hydrogen sulphide

Question 10
The main constituent of biogas is

(a) methane
(b) carbon dioxide
(c) hydrogen
(d) hydrogen sulphide

The constituent of polluted air which contributes in producing acid rain is:

(a) nitrogen

(b) sulphur dioxide

(d) argon

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