Question

oxidation number underlined atom NaH2PO4 underlined. P
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Answer 1

NaH₂PO₄

Na and H have oxidation number +1

O has oxidation number -2

Let oxidation number of P be x

Sum of total oxidation number = 0

1+2+x-8 = 0

-5+x = 0

x = 5

Answer 2

Answer: 5

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

From this x = +5