1.

The oxidation nunber of P in `HP_(2)O_(7)^(-)` ion isA. `+5`B. `+6`C. `+7`D. `+3`

Answer» Correct Answer - B
Let O.N. of P in `HP_(2)O_(7)^(-)` ion = x
`:. 1+2x + 7 (-2) = -1`
`2x = -1 + 13 or x =6`.


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