A) \[Fe\xrightarrow{C{{l}_{2}},\,heat}FeC{{l}_{2}}\xrightarrow{heat,air}FeC{{l}_{2}}\xrightarrow{Zn}Fe\]
B) \[Fe\xrightarrow{{{O}_{2}},\,heat}F{{e}_{2}}{{O}_{4}}\xrightarrow{CO,{{600}^{0}}C}FeC{{l}_{3}}\xrightarrow{CO,{{700}^{0}}C}Fe\]
C) \[Fe\xrightarrow{dil,{{H}_{2}}S{{O}_{4}}}Fe{{O}_{4}}\xrightarrow{{{H}_{2}}S{{O}_{4}},{{O}_{2}}}Fe{{(S{{O}_{4}})}_{3}}\xrightarrow{heat}Fe\]
D) \[Fe\xrightarrow{{{O}_{2}},heat}FeO\xrightarrow{dil,{{H}_{2}}S{{O}_{4}}}FeS{{O}_{4}}\xrightarrow{heat}Fe\]
Correct Answer: B
Solution :
[b] In [a], \[FeC{{l}_{3}}\] cannot be reduced when heated in air. In [c], \[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\] cannot be converted to Fe on heating; instead oxide(s) will be formed. In [d], \[F{{e}_{2}}S{{O}_{4}}\] cannot be converted to Fe on heating; instead oxide(s) will be formed. Hence [b] is correct.
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