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JAMB Chemistry 1985 Question 28

Question 28

Alkanols

A man suspected of being drunk is made to pass his breath into acidified potassium dichromate solution. If his breath carries a significant level of ethanol, the final colour of the solution is

  1. A.pink
  2. B.purple
  3. C.orange
  4. D.blue-black
  5. E.green
Show the answer and explanation

Answer: E (green)

Explanation

Ethanol reduces the orange dichromate (VI) ion to green chromium (III) ions, so the solution turns from orange to green.