Assertion :Sodium metal reacts with the oxygen of the air at room temperature to form sodium oxide. Reason: Metal forms an oxide on exposure to air.

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.
$4 N a + O_{2} ⟶ 2 N a_{2} O$
Sodium metal reacts with the oxygen of the air at room temperature to form sodium oxide. Hence, sodium is stored under kerosene to prevent its reaction with oxygen, moisture and carbon dioxide.
Hence, Both Assertion and Reason are correct and the Reason is the correct explanation for Assertion.

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