In which one of the following cases do both physical and chemical changes take place ........

General Science (CDS) Physics

In which one of the following cases do both physical and chemical changes take place ?

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2023 CDS -2 GK

Burning of candle

Freezing of water

Cooking of food

Rusting of iron

- Option 1: Burning of candle

- Physical change: Melting of wax. Wax changes from solid to liquid as it heats up.

- Chemical change: Burning wax produces carbon dioxide and water vapor.

- Option 2: Freezing of water

- Physical change only: Water changes from liquid to solid (ice). No new substance is formed.

- Option 3: Cooking of food

- Chemical change: New substances are formed, altering the taste, color, and aroma.

- Physical change might occur, such as water evaporation, but chemical change is dominant.

- Option 4: Rusting of iron

- Chemical change only: Iron reacts with oxygen to form rust (iron oxide). It’s purely chemical as it creates a new substance.

Correct Answer: Option 1 - Burning of candle

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