Question

oxidation number of P is +3 in..
1.H3PO2
2.H3PO3
3.H3PO4
4.H4PO3​

Answer 1

oxidation no. of p is +3 in H3PO4

Answer 2

lets go by option verification

oxidation state of hydrogen=+1

oxidation state of oxygen=-2

oxidation state of phosphorous be x

1)H3PO2

so: 3(+1)+ x+2(-2)=0

3+x-4=0

x=+1

2) H3PO3

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

3+x-6=0

x=+3

3)H3PO4

3(+1)+x+4(-2)=0

3+x-8=0

x=+5

4)H4PO3

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

4+x-6=0

x=+2.

so the answer is 2.

hope the answer is helpful.