Chemistry WAEC

The oxidation number of iodine in the iodate ion (IO‾³) is?

A. -5
B. -1
C. +1
D. +5

Correct Answer: Option D

D. +5

Explanation

IO‾³
[oxidation number of 1] + [oxidation number of 0] x 3 = -1
x + -2 x 3 = 1
x – 6 = – 1
x = – 1 + 6 = +5

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