The P Block Elements - Result Question 29
####29. Pure nitrogen is prepared in the laboratory by heating a mixture of
[1991]
(a) $NH_4 OH+NaCl$
(b) $NH_4 NO_3+NaCl$
(c) $NH_4 Cl+NaOH$
(d) $NH_4 Cl+NaNO_2$.
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Solution:
- (d) Pure nitrogen in the lab can be obtained by heating ammonium nitrate. Ammonium nitrate is not a stable compound it dissociate to give nitrogen.
$ \begin{aligned} NH_4 Cl+NaNO_2 \xrightarrow{\text{ Heat }} NH_4 NO_2 \\ \xrightarrow{\text{ Heat }} N_2+2 H_2 O . \end{aligned} $
