Correct Answer: Option B

Explanation

Nitrogen is prepared in the laboratory by heating an equimolar aqueous solution of ammonium chloride and sodium nitrite. The ammonium nitrite formed as a result of a double decomposition reaction, decomposes to form nitrogen gas.

\(NH_4Cl_{(aq)}+NaNO_{2(aq)} → NH_4NO_{2(aq)}+NaCl_{(aq)}\)

\(NH_4NO_{2(aq)} →N_{2(g)}  +2H_2O_{(l)}\).

(source: understanding chemistry by G O Ojukuku)

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