Question

Which of the following is not a reversible change?

• A. Melting ice-cream
• B. Cooking noodles
• C. Crumpling paper
• D. Boiling water

Answer 1

The correct option is B Cooking noodles

Melting of ice-cream: Melted ice-cream can be frozen back. So it’s a reversible change.​

Cooking noodles: We can't get back the raw noodles once it’s cooked. So it’s an irreversible change.
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Crumpling paper: The crumpled paper can be uncrumpled. So it’s a reversible change.​

Boiling water: Water that is converted into steam due to boiling can be condensed to liquid water. So it’s also a reversible change.​