Assertion : $H_{3} P O_{2}$ is a monobasic acid. Reason: Two $H$ -atoms are directly attached to phosphorous $(P)$ .

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
From the structure given below, it can be seen that only one hydrogen is attached with oxygen directly so it is monobasic. (or two $H$ s are attached directly to $P$ )

Hence, the correct option is $A$

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Assertion :H3PO2 is a monobasic acid. Reason: Two H-atoms are directly attached to phosphorous (P).

Assertion : $H_{3} P O_{2}$ is a monobasic acid. Reason: Two $H$ -atoms are directly attached to phosphorous $(P)$ .