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JAMB Chemistry 2002 Question 11

Question 11

Redox Reactions

When H2S is passed into a solution of iron (III) chloride, the solution turns

  1. A.pale green
  2. B.pale red
  3. C.brown
  4. D.colourless.
Show the answer and explanation

Answer: A (pale green)

Explanation

H2S is a reducing agent: it reduces yellow-brown Fe3+ to Fe2+, which is pale green (and yellow sulphur is deposited).