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Question

Nitrogen exists in its elemental form as


A

Mono atomic gas

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B

Diatomic gas

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C

Triatomic gas

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D

None of these

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Solution

The correct option is B

Diatomic gas


Nitrogen atom is small in size and has the tendency to form pπpπ multiple bonds. In fact, the Nitrogen – Nitrogen triple bond in N2 molecule has very high thermodynamic stability. It has a dissociation energy 942 kj.mol1
This makes nitrogen exist as a diatomic gas at room temperature. Also, this increased stability of the N≡N makes it non polar and hence the Van der Waals forces between the molecules are low. This is the reason why Nitrogen is a gas at room temperature. These reasons also make N2 molecule pretty inert at ordinary temperatures and pressure(s).


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