A) \[Fe\]
B) \[Pt\]
C) \[Ni\]
D) \[Co\]
Correct Answer: A
Solution :
\[Fe\] Because it easily gets oxidized in moist air. \[Fe\,\underset{{{H}_{2}}O/{{H}^{+}}}{\mathop{\xrightarrow{\text{air }}}}\,\,\underset{\text{Rust}}{\mathop{F{{e}_{2}}{{O}_{3}}.x\,{{H}_{2}}O}}\,\]
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