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

Chemistry
WAEC 2006
The oxidation number of iodine in the iodate ion (IO -3) is
  • A. -5
  • B. -1
  • C. +1
  • D. +5
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Correct Answer: Option D
Explanation
1O3
[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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