(D) Let the oxidation number of nitrogen be $x$.In the nitrate ion,$NO_3^-$,the sum of the oxidation numbers of all atoms equals the charge on the ion

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(D) Let the oxidation number of nitrogen be $x$.In the nitrate ion,$NO_3^-$,the sum of the oxidation numbers of all atoms equals the charge on the ion,which is $-1$.The oxidation number of oxygen is $-2$.Therefore,$x + 3(-2) = -1$.$x - 6 = -1$.$x = +5$.