Question

Which of the following are examples of chemical reactions?

i. Burning of wood

ii. Cutting of wood

iii. Conversion of steam to water

iv. Rusting of almirah

• A. i, iv
• B. i, iii
• C. ii, iv
• D. ii, iii

Answer 1

The correct option is A i, iv

Burning of wood - Chemical change ‐ The chemical composition of wood changes.

Cutting of wood - Physical change - The chemical composition remains the same, only the size of the wood changes.

Conversion of steam to water- Physical change - No change in chemical nature of the substance.

Rusting of almirah- Chemical change ‐ Iron present in almirah converts into iron oxide (new compound) due to the presence of air and moisture.