Question

Select the correct answer from the choices A, B, C, and D which are given. Write only the letter corresponding to the correct answer.
Which of the following would not be a physical change?

• A. Freezing water to make ice cubes.
• B. Melting gold to make jewellery
• C. Burning gasoline in a lawnmower
• D. Boiling water for soup

Answer 1

The correct option is C

Burning gasoline in a lawnmower

Explanation for correct option:

Option C

Chemical change:

• A chemical change is a permanent change in which new substances are formed.
• The chemical change is permanent and cannot be reversed by a simple physical method.
• A chemical change involves an exchange of energy in the form of heat or light.
• For example, rusting of iron, burning of wood, respiration, etc.
• Burning gasoline in a lawnmower is a chemical change.
• During burning or combustion, new substances are formed.

Therefore, option C is correct.

Explanation for incorrect option:

• During freezing water to make ice cubes, melting gold to make jewellery, and boiling water for soup no new substances are formed. Only states changed.
• They all are physical changes.

Physical change:

• A physical change is a change in which no new substance is formed.
• A physical change is temporary and reversible.
• In a physical change, the chemical composition of the original substance is not altered.
• For example, drying wet clothes, breaking of a glass tumbler, drying paints, etc.

Therefore, options A, B, and D are incorrect.