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Q.

Which gas is produced when coal is heated in the air?

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a

H2

b

N2

c

CO2

d

NO2 

answer is A.

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Detailed Solution

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When coal is heated in the air, the gas produced is CO2.
Coal primarily burns as carbon dioxide gas when heated in the presence of air, and no other useful products are produced. Some other products obtained in this reaction are water, light and heat. The reaction is given as:
Coal + O2 (from air) → CO2 + heat + light
                                    

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