A) \[{{N}_{2}}O\]
B) \[NO\]
C) \[{{N}_{2}}{{O}_{3}}\]
D) \[{{N}_{2}}{{O}_{5}}\]
Correct Answer: B
Solution :
Nitric oxide (NO) may contain impurities of \[N{{O}_{2}}\]and\[N{{O}_{2}}\]. It is purified by absorbing it in ferrous sulphate \[(F{{e}^{2+}})\] solution, the dark brown nitro so ferrous sulphate is obtained, on heating it pure nitric oxide is liberated. \[[Fe{{({{H}_{2}}O)}_{6}}]S{{O}_{4}}+\underset{\begin{smallmatrix} impure \\ gas \end{smallmatrix}}{\mathop{NO}}\,\xrightarrow{-{{H}_{2}}O}[Fe{{({{H}_{2}}O)}_{5}}NO]\]\[S{{O}_{4}}\xrightarrow{heat}FeS{{O}_{4}}+\underset{pure\,gas}{\mathop{NO}}\,+5{{H}_{2}}O\]
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