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JAMB Chemistry 1978 Question 10

Question 10

Redox Reactions

The oxidation state of chlorine in potassium chlorate is:

  1. A.+1
  2. B.+2
  3. C.+3
  4. D.+5
  5. E.+7
Show the answer and explanation

Answer: D (+5)

Explanation

In KClO3: (+1) + x + 3(−2) = 0, so x = +5.