Assertion (A): Kerosene is used to store sodium metal.
Reason (R): When sodium metal is exposed to air, it melts.

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Both A and R are true, and R is the correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

answer is C.

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Detailed Solution

Sodium is a very reactive metal. To prevent it from coming in contact with oxygen and moisture, it is kept in kerosene. If it comes in contact with air, it absorbs moisture and reacts vigorously with oxygen and water and forms sodium hydroxide, which is a highly exothermic reaction. Kerosene oil does not react with sodium and acts as a barrier which prevents its reaction with oxygen and moisture.

Hence, the correct option is (c) A is true, but R is false.

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