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Q.

A gas at low temperature does not react with most of the compounds. It is almost inert and is used to create inert atmosphere in bulbs. 

The combustion of this gas is exceptionally an endothermic reaction. Based on the given information, we can conclude that the gas is:

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a

oxygen

b

nitrogen

c

carbon mono-oxide

d

hydrogen

answer is B.

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Detailed Solution

Under normal circumstances, nitrogen has no chemical properties. However, when heated, it exhibits chemical activity. Due to its inertness, 

It is used to fill electrical bulbs and to provide inert atmosphere in specific metallurgical atmospheres. Under the influence of a high temperature (30000C), nitrogen and oxygen mix to form an electric spark.
N2+O22NO

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