A) \[Fe{{(N{{O}_{3}})}_{2}}\]
B) \[Fe{{C}_{2}}{{O}_{4}}\]
C) \[[Fe{{({{H}_{2}}O)}_{6}}]\,C{{l}_{3}}\]
D) \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\,\,FeS{{O}_{4}}\,\,6{{H}_{2}}O\]
Correct Answer: D
Solution :
Let the oxidation number of iron is x. [a] \[Fe{{(N{{O}_{3}})}_{2}}\Rightarrow x+2(-1)=0\Rightarrow x=+2\] [b] \[Fe{{C}_{2}}{{O}_{4}}\Rightarrow Fe{{(COO)}_{2}}\Rightarrow x+2(-2)=0\]\[\Rightarrow x=+4\] [c] \[[Fe{{({{H}_{2}}O)}_{6}}]C{{l}_{3}}\Rightarrow x+6\times 0+3(-1)=0\]\[\Rightarrow x=+3\] [d] \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.FeS{{O}_{4}}6{{H}_{2}}O\Rightarrow FeS{{O}_{4}}\]\[\Rightarrow x+1(-2)=0\Rightarrow x=+2\]
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