Assertion : $H_{2} P O_{2}^{-}$ is a Bronsted acid. Reason: Proton donors are examples of Bronsted acids.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
$H_{3} P O_{2}$ is a monoprotic acid. Therefore, $H_{2} P O_{2}^{-}$ has no ionisable hydrogen atoms. The two hydrogens are directly attached to the P atom. So, the assertion is false.
Bronsted acids are $H^{+}$ donors. So, the reason is correct.

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