The rusting of iron is catalysed by

Options

A. Fe
B. `O_(2)`
C. `H^(+)`
D. Zn

Answer

c

Explanation

The reaction occurring during rusting process are as follows :
At anode: `Fe(s) to Fe^(2+)(aq) + 2e`
At cathode:
`O_(2)(g) + 4H^(+)(aq) to 2H_(2)O`
The `Fe^(2+)` ions, formed, are further oxidised by atmosphere oxygen to `Fe^(3+)` (as `Fe_(2)O_(3)`) and come as rust `(Fe_(2)O_(3).xH_(2)O)`. The `H^(+)`, formed in the rust formation, catalysed the process of rusting.