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JAMB Chemistry 1978 Question 38

Question 38

Redox Reactions

If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is

  1. A.dilute sulphuric acid
  2. B.dilute hydrochloric acid
  3. C.unreacted hydrogen sulphide in water
  4. D.iron (III) chloride
  5. E.iron (II) chloride.
Show the answer and explanation

Answer: E (iron (II) chloride.)

Explanation

H2S reduces iron(III) chloride to pale green iron(II) chloride and is itself oxidised to yellow sulphur.