Very pure N2 can be obtained by

Treating aqueous solution of NH 4 Cl with NaNO 2

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Very pure N₂ can be obtained by

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Thermal decomposition of ammonium dichromate

Treating aqueous solution of NH₄Cl with NaNO₂

Liquifaction and fractional distillation of liquid air

Thermal decomposition of sodium azide

answer is D.

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$\underset{sodium azide}{2 {NaN}_{3}} \to 2 Na + 3 N_{2}$

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