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(D) The balanced equation is $P_4 + 3OH^{-} + 3H_2O \longrightarrow PH_3 + 3H_2PO_2^{-}$.Comparing coefficients: $a=1, b=3, c=3, d=1, e=3$.Statement $

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$II, III$ only

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(D) The balanced equation is $P_4 + 3OH^{-} + 3H_2O \longrightarrow PH_3 + 3H_2PO_2^{-}$.Comparing coefficients: $a=1, b=3, c=3, d=1, e=3$.Statement $I$: $a+b+c = 1+3+3 = 7$. Thus,$I$ is incorrect.Statement $II$: $b+c-e = 3+3-3 = 3$. Thus,$II$ is correct.Statement $III$: In $H_2PO_2^{-}$,let oxidation state of $P$ be $x$. $2(+1) + x + 2(-2) = -1 \implies 2 + x - 4 = -1 \implies x = +1$. Thus,$III$ is correct.Therefore,statements $II$ and $III$ are correct.

Identify the correct statements about the following stoichiometric equation.
$aP_4 + bOH^{-} + cH_2O \longrightarrow dPH_3 + eH_2PO_2^{-}$
$I$. $a+b+c=5$
$II$. $b+c-e=3$
$III$. The oxidation state of $P$ in $H_2PO_2^{-}$ is $+1$.

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Identify the correct statements about the following stoichiometric equation.$aP_4 + bOH^{-} + cH_2O \longrightarrow dPH_3 + eH_2PO_2^{-}$$I$. $a+b+c=5$$II$. $b+c-e=3$$III$. The oxidation state of $P$ in $H_2PO_2^{-}$ is $+1$.