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JAMB Chemistry 1993 Question 25

Question 25

Redox Reactions

The oxidation states of chlorine in HOCl, HClO3 and HClO4 are respectively

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

Answer: D (+1, +5 and +7)

Explanation

With H = +1 and O = −2: in HOCl, Cl = +1; in HClO3, 1 + Cl − 6 = 0 gives +5; in HClO4, 1 + Cl − 8 = 0 gives +7.