Question

The rusting of iron is catalysed by which of the following?

• A. Fe
• B. $O_2$
• C. Zn
• D. $H^{+}$

Answer 1

Answer: (D)

The rusting of iron is catalysed by $H^{+}$ (acidic medium)
$O_2+4H^{+}+4e^{-}\to 2H_{2}O$
The more the concentration of $H^{+}$ , the faster is the rusting of iron.