Question

Rusting of iron is catalysed by :

• A. H${}^{+}$ ions
• B. dissolved $C{O}_2$ in water
• C. O${}_2$
• D. impurities present

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A H${}^{+}$ ions
B O${}_2$
C dissolved $C{O}_2$ in water
D impurities present

The hydrogen ions and the dissolved gases such as carbon dioxide and water catalyze the rusting of iron.
Certain impurities also catalyze the rusting of iron.