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The basicity of phosphorus acid (H3 PO3)...

The basicity of phosphorus acid `(H_3 PO_3)` is ______ .

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The correct Answer is:
Two
The basicity of phosphorous acid `(H_3 PO_3) is 2`.
For structure, refer to Solution `Q. 1 (vi)` Integer type.
Only those hydrogens are replaceable that are attached to oxygen an contribute to basicity. From the structure, it is clear that phosphorous acid `(H_3 PO_3)` is dibasic.
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