Which of the following gives purest form of nitrogen?

Thermal decomposition of ammonium nitrate

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Treating aqueous solution of ammonium chloride with sodium nitrite

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Thermal decomposition of sodium or barium azide

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Liquefaction and fractional distillation of air

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Solution

The correct option is B Thermal decomposition of sodium or barium azide
$2 N a N_{3} \to 2 N a + 3 N_{2}$
Pure nitrogen can be obtained from thermal decomposition of sodium or barium azide.

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Which of the following compounds are used to prepare $N_{2}$ ?

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