In which of the following acids is the phosph | vedclass

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(D) To find the oxidation state of phosphorus $(P)$ in each acid,we use the rule that the sum of oxidation states in a neutral molecule is $0$. Let th

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Hypophosphorous acid

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(D) To find the oxidation state of phosphorus $(P)$ in each acid,we use the rule that the sum of oxidation states in a neutral molecule is $0$. Let the oxidation state of $P$ be $x$.$A$. Hypophosphoric acid $(H_4P_2O_6)$: $4(1) + 2x + 6(-2) = 0$ $\Rightarrow 4 + 2x - 12 = 0$ $\Rightarrow 2x = 8$ $\Rightarrow x = +4$.$B$. Orthophosphorous acid $(H_3PO_3)$: $3(1) + x + 3(-2) = 0$ $\Rightarrow 3 + x - 6 = 0$ $\Rightarrow x = +3$.$C$. Pyrophosphorous acid $(H_4P_2O_5)$: $4(1) + 2x + 5(-2) = 0$ $\Rightarrow 4 + 2x - 10 = 0$ $\Rightarrow 2x = 6$ $\Rightarrow x = +3$.$D$. Hypophosphorous acid $(H_3PO_2)$: $3(1) + x + 2(-2) = 0$ $\Rightarrow 3 + x - 4 = 0$ $\Rightarrow x = +1$.Comparing the oxidation states: $+4, +3, +3, +1$. The lowest oxidation state is $+1$,which corresponds to Hypophosphorous acid.

Column-$I$	Column-$II$
$A$. $Cr_2O_7^{2-}$	$1$. $+3$
$B$. $MnO_4^{-}$	$2$. $+4$
$C$. $VO_3^{-}$	$3$. $+5$
$D$. $FeF_6^{3-}$	$4$. $+6$
	$5$. $+7$

In which of the following acids is the phosphorus atom present in its lowest oxidation state?

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