Question

oxidation no of underline element Na H2 _p_O4 and K2 _Mn_O4.

Answer 1

In NaH2PO4, the oxidation no. of P is +5
1+2+X-8=0
X= +5

In K2Mn04, the oxidation no. of Mn is +6
2+X-8=0
X= +6

Hope you get your answer.