Question

Which of the following are chemical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal

• A. only (ii)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (i) and (iv)

Answer 1

Answer: (A)

only (ii)

Rusting of iron is a redox reaction and its a chemical change, apart from this all others are physical changes.

The rusting of Iron (Iron in contact with water forms the anode and in contact with air forms the cathode. At the anode iron is oxidised to $F{e}^{2+}$ and at the cathode oxygen is reduced to water