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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Nitrogen compounds: ammonia, oxides of nitrogen, nitric acid

NEET levelSingle correct optionDifficulty 1 of 3pn166

Which of the following reactions is used in the laboratory to obtain nearly pure dinitrogen?

APassing $NH X_{3}$ and $O X_{2}$ over hot platinum
BHeating $NH X_{4} NO X_{3}$ gently to about 520 K
CTreating copper with dilute $HNO X_{3}$
DWarming an aqueous solution of $NH X_{4} Cl$ with $NaNO X_{2}$

Answer: D

Aqueous

NH X_{4} Cl

and

NaNO X_{2}

react on warming:

NH X_{4} Cl + NaNO X_{2} N X_{2} + 2 H X_{2} O + NaCl

, giving nearly pure

N X_{2}

. Copper with dilute nitric acid gives

NO

, catalytic oxidation of ammonia gives

NO

, and gentle heating of ammonium nitrate gives

N X_{2} O

.

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