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Q. Phosphorus has the oxidation state +3 in

The p-Block Elements - Part2

Solution:

$ H_3^{+1} \, PO_3^{x-2} $
+ 1 x 3 + $x$ - 2 x 3 = 0
or $x$ + 3 - 6 = 0 or $x$ = + 3