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(A) The chemical formula of phosphorous acid is $H_3PO_3$. In its structure,there is one $P=O$ bond,two $P-OH$ bonds,and one $P-H$ bond. Wait,let us r

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$1$

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(A) The chemical formula of phosphorous acid is $H_3PO_3$. In its structure,there is one $P=O$ bond,two $P-OH$ bonds,and one $P-H$ bond. Wait,let us re-examine the structure: The structure of $H_3PO_3$ consists of one $P=O$ bond,two $P-OH$ groups,and one $P-H$ bond. Therefore,the number of hydrogen atoms directly attached to the phosphorus atom is $1$.

The number of hydrogen atoms directly attached to the phosphorus atom in phosphorous acid is

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