A) \[{{[Fe({{H}_{2}}O){{(NO)}_{5}}]}^{2+}}\]
B) \[{{[Fe{{({{H}_{2}}O)}_{5}}(NO)]}^{2+}}\]
C) \[Fe{{(N{{O}_{3}})}_{3}}\]
D) \[{{[Fe{{({{H}_{2}}O)}_{5}}(N{{O}_{2}})]}^{2+}}\]
Correct Answer: B
Solution :
: Ring test: \[NaN{{O}_{3}}+{{H}_{2}}S{{O}_{4}}\to NaHS{{O}_{4}}+HN{{O}_{3}}\] \[6FeS{{O}_{4}}+2HN{{O}_{3}}+3{{H}_{2}}S{{O}_{4}}\to 3F{{e}_{2}}{{(S{{O}_{4}})}_{3}}+\] \[4{{H}_{2}}O+2NO\] \[[Fe{{({{H}_{2}}O)}_{6}}]S{{O}_{4}}.{{H}_{2}}O+NO\to \] \[\underset{Brown\text{ }ring}{\mathop{[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}}}\,+2{{H}_{2}}O\]
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