Question

An example of a physical change is

• A. rusting of iron
• B. digestion of food
• C. melting of ice
• D. burning of wood

Answer 1

The correct option is C melting of ice

In melting ice,no new substance is formed and it is considered to be a physical change. In rusting of iron, oxidation reaction takes place and it is considered as irreversible so, it is a chemical change.

In digestion of food, food is broken down into glucose and glucose gets converted to energy. A new substance(glucose) is formed even in digestion of food so, it is a chemical change. Burning of wood, a new substance ash is formed so, it is a chemical change.