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WAEC - Chemistry (2017 - No. 15)
The oxidation number of X in \(XO_{4}^{3-}\) is
+1
+3
+4
+5
Maelezo
\(XO_{4}^{3+}\) = \(X + (-2\times 4) = -3\)
\(X = -3+8 = +5\)
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