(D) The oxidation state of phosphorus $(P)$ in its oxyacids ranges from $+1$ to $+5$. In hypophosphorous acid $(H_3PO_2)$,the oxidation state of $P$ i

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(D) The oxidation state of phosphorus $(P)$ in its oxyacids ranges from $+1$ to $+5$. In hypophosphorous acid $(H_3PO_2)$,the oxidation state of $P$ is calculated as: $3(+1) + x + 2(-2) = 0$ $3 + x - 4 = 0$ $x - 1 = 0$ $x = +1$. Thus,the lowest oxidation state of phosphorus in its oxyacids is $+1$.