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(B) To determine the number of $P-H$ bonds,we examine the structures of the given oxoacids of phosphorus:$1$. $H_3PO_2$ (Hypophosphorous acid): It has

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$H_3PO_2$

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(B) To determine the number of $P-H$ bonds,we examine the structures of the given oxoacids of phosphorus:$1$. $H_3PO_2$ (Hypophosphorous acid): It has two $P-H$ bonds and one $P=O$ bond.$2$. $H_3PO_3$ (Phosphorous acid): It has one $P-H$ bond and one $P=O$ bond.$3$. $H_3PO_4$ (Orthophosphoric acid): It has zero $P-H$ bonds and one $P=O$ bond.$4$. $H_4P_2O_7$ (Pyrophosphoric acid): It has zero $P-H$ bonds.Comparing these,$H_3PO_2$ contains the highest number of $P-H$ bonds (two).

Which of the following has the highest number of $P-H$ bonds?

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