[BHU 1979]
A) $ Fe $
B) $ Pt $
C) $ Ni $
D) $ Co $
Correct Answer: A
$ Fe $ Because it easily gets oxidized in moist air.
$ Fe,\underset{H_2O/{{H}^{+}}}{\mathop{\xrightarrow{\text{air }}}}\underset{Rust}{\mathop{Fe_2O_3.x,H_2O}}, $
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