Assertion :On heating a substance to its melting point, inter-particle space increases. Reason: When a substance is heated, the kinetic energy of the particles(molecules/atoms) increases, due to which they push each other farther than their mean position.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Because when a substance is heated the kinetic energy of the partilces(molecules/atoms) increases due to which they push each other farther than their mean position, therefore the distance between the particles(inter-molecular space) increases.

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