A) iron
B) potassium
C) copper
D) mercury
E) sodium
Correct Answer: A
Solution :
\[Fe+\underset{dill.}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,\xrightarrow[{}]{{}}FeS{{O}_{4}}+{{H}_{2}}\uparrow \] \[\underset{hot}{\mathop{3Fe}}\,+4\underset{(steam)}{\mathop{{{H}_{2}}O}}\,\xrightarrow[{}]{{}}4{{H}_{2}}\uparrow +F{{e}_{3}}{{O}_{4}}\]
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