passwella.
Menu

JAMB Chemistry 1995 Question 36

Question 36

Sulphur and its Compounds

A gas that will turn orange potassium heptaoxodichromate (VI) solution to clear green is

  1. A.sulphur (VI) oxide
  2. B.hydrogen sulphide
  3. C.sulphur (IV) oxide
  4. D.hydrogen chloride
Show the answer and explanation

Answer: C (sulphur (IV) oxide)

Explanation

SO2 reduces orange dichromate(VI) to green chromium(III), giving a clear green solution. H2S also reduces it but leaves a cloudy yellow deposit of sulphur.