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Q. What is the oxidation state of $P$ in $Ba(H_{2}PO_{2})_{2}$ ?

Haryana PMTHaryana PMT 2006

Solution:

Let the oxidation state of $P$ is $x$, then
$2(+1)+2[2(+1)+x+2(-2)]=0$
$2+2(2+x-4)=02+4+2 x-8$
$=02+2 x-4=0$
$2 x=2 x=+1$