Question

Oxidation number of 'p' in h3po2?

Answer 1

x+3-2(-2)=0

x+3-4=0

x-1=0

x=+1

Answer 2

Oxidation number of P in H3PO2 is +1. To calculate the oxidation number

H = 1

O = -2

The sum of all of the oxidation number on a molecule /ion is equal to the charge so as H3PO2 is a neutral molecule:-

3 x (+1) + $x$ +2 x (-2) = 0

3 + $x$ - 4 = 0

$x$ = + 1

Oxidation Number of P = +1