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Basicity of `H_3 PO_4` and `H_3 PO_3` are

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Basicity of `H_3 PO_4` and `H_3 PO_3` are
A. `3, 3`
B. `3, 2`
C. `2, 3`
D. `2, 2`
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Correct Answer - B
`H_3 PO_4` has `3P - OH` groups whereas `H_3 PO_3` has `2 P - OH` groups, hence they are tribasic respectively.
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