Assertion :The acidity of $M g (O H)_{2}$ is two. Reason: The acidity of a base is equal to the number of hydroxyl ions.

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 number of replaceable hydroxyl ( $O H^{-}$ ) Ions in a base is called the acidity of that base.

Magnesium hydroxide has 2 replaceable hydroxyl ions, therefore it's acidity is 2.

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