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Melting

Identify the ...

Question

Identify the substance which will not melt to form liquid on heating.

Ice

Mothballs

Butter

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Solution

Ice and butter melt when heated. They change from solid to liquid.
When mothballs (naphthalene balls) are heated, they directly change from solid to gas by the process of sublimation. They do not melt to form a liquid.
So, option 2, mothballs is the correct answer.

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