Assertion :Although aluminium is above hydrogen in electrochemical series, it is stable in air and water.
Reason: The thin protective layer of oxide $(A l_{2} O_{3})$ on the surface protects the aluminium.

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
The metal aluminium is stable in air and water due to their thin protective layer supported from oxides $(A l_{2} O_{3})$ which prevents aluminium from spontaneous reaction. Hence aluminium is stable in air and water.
Hence both Assertion and Reason are correct and also Reason is correct explanation for Assertion.

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