A) \[(N{{H}_{4}})C{{r}_{2}}{{O}_{7}}\xrightarrow{\Delta }\]
B) \[N{{H}_{4}}Cl+NaN{{O}_{2}}\xrightarrow{\Delta }\]
C) \[N{{H}_{3}}+NaN{{O}_{2}}\xrightarrow{\Delta }\]
D) \[{{N}_{2}}O+Cu\xrightarrow{\Delta }\]
Correct Answer: B
Solution :
In laboratory, pure \[{{\text{N}}_{\text{2}}}\]gas is prepared by heating \[\text{N}{{\text{H}}_{\text{4}}}\text{Cl}\]with sodium nitrite. \[N{{H}_{4}}Cl+NaN{{O}_{2}}\xrightarrow{\Delta }\underset{\underset{\text{pure}}{\mathop{{{N}_{2}}\,+}}\,\,\,2{{H}_{2}}O}{\mathop{N{{\underset{\downarrow }{\mathop{H}}\,}_{\Delta }}_{4}}}\,N{{O}_{2}}+NaCl\]
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