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JAMB Chemistry 1980 Question 27

Question 27

Redox Reactions

In which of the following is the oxidation state of oxygen different from its value in water?

  1. A.OH−
  2. B.H3O+
  3. C.O−
  4. D.H2O2
  5. E.SO2.
Show the answer and explanation

Answer: D (H2O2)

Explanation

In water oxygen is −2. In hydrogen peroxide each oxygen is −1 (2(+1) + 2x = 0). In OH−, H3O+ and SO2 it is still −2.