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Write basicity of H3PO2,H3PO3 and H3PO4 ...

Write basicity of `H_3PO_2,H_3PO_3` and `H_3PO_4` .

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Basicity of `H_3PO_4` IS 3 (Tribasic acid)
Basicity of `H_3PO_3` is 2 (dibasic acid )
Basicity of `H_3PO_2` is 1 (monobasic acid)
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