Nitrogen shows allotropy in _____ state.

gaseous

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liquid

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solid

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liquid and solid

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Solution

The correct option is C solid
At atmospheric pressure, molecular nitrogen condenses (liquefies) at 77 K (−195.79 ∘C) and freezes at 63 K (−210.01 ∘C) into the beta hexagonal close-packed crystal allotropic form.

Unstable allotropes of nitrogen consisting of more than two nitrogen atoms have been produced in the laboratory, like N3 and N4. Other (as yet unsynthesized) allotropes include hexazine and octaazacubane.
Hence, option C is correct.

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