(D) Let the oxidation number of $P$ be $x$.In $KH_2PO_2$,the oxidation numbers of other elements are:$K = +1$$H = +1$$O = -2$Sum of oxidation numbers

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(D) Let the oxidation number of $P$ be $x$.In $KH_2PO_2$,the oxidation numbers of other elements are:$K = +1$$H = +1$$O = -2$Sum of oxidation numbers = $0$$(+1) + 2(+1) + x + 2(-2) = 0$$1 + 2 + x - 4 = 0$$x - 1 = 0$$x = +1$Therefore,the oxidation number of $P$ is $+1$.