A) \[[Fe{{[{{H}_{2}}O]}_{5}}.NO]S{{O}_{4}}\]
B) \[[Fe{{[S{{O}_{4}}]}_{2}}.NO]{{H}_{2}}O\]
C) \[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}.NO\]
D) None of the above
Correct Answer: A
Solution :
Brown ring which indicates the presence of \[NO_{3}^{-}\]group in compound has chemical composition\[[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}.\]. \[2NaN{{O}_{3}}+{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{{}}2NaHS{{O}_{4}}+2HN{{O}_{3}}\] \[2HN{{O}_{3}}+6FeS{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{{}}\] \[3F{{e}_{2}}{{(S{{O}_{4}})}_{3}}+2NO+4{{H}_{2}}O\] \[[Fe{{({{H}_{2}}O)}_{6}}]S{{O}_{4}}+NO\xrightarrow[{}]{{}}\] \[[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}+{{H}_{2}}O\]
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