Which of the following is a tetrabasic acid?

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(D) The basicity of an oxoacid of phosphorus is determined by the number of $P-OH$ groups present in its structure.$1$. Orthophosphoric acid $(H_3PO_4

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Pyrophosphoric acid

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(D) The basicity of an oxoacid of phosphorus is determined by the number of $P-OH$ groups present in its structure.$1$. Orthophosphoric acid $(H_3PO_4)$ has $3$ $P-OH$ groups,so it is tribasic.$2$. Hypophosphorous acid $(H_3PO_2)$ has $1$ $P-OH$ group,so it is monobasic.$3$. Metaphosphoric acid $(HPO_3)_n$ is generally monobasic per unit.$4$. Pyrophosphoric acid $(H_4P_2O_7)$ has $4$ $P-OH$ groups,making it a tetrabasic acid.

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