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JAMB Chemistry 1989 Question 34

Question 34

Redox Reactions

Which of the following reactions is (are) feasible?
I Br2(l) + 2Cl−(aq) → 2Br−(aq) + Cl2(g)
II 2I−(aq) + Br2(l) → 2Br−(aq) + I2(s)
III 2F−(aq) + Cl2(g) → 2Cl−(aq) + F2(g)
IV 2F−(aq) + Br2(l) → 2Br−(aq) + F2(g)

  1. A.I
  2. B.II
  3. C.I and III
  4. D.III and IV
Show the answer and explanation

Answer: B (II)

Explanation

A halogen can only displace a halogen below it in the group. Bromine is more reactive than iodine, so II works; bromine and chlorine cannot displace chlorine or fluorine.