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JAMB Chemistry 1985 Question 42

Question 42

Hydrocarbons

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize bromine vapour, Y turns lime milky while Z gives a blue colour with copper (II) tetraoxosulphate (VI). Y and Z are respectively

  1. A.CO2 and NH3
  2. B.CO and NH3
  3. C.SO2 and H2O
  4. D.CO2 and H2O
  5. E.SO2 and NH3.
Show the answer and explanation

Answer: D (CO2 and H2O)

Explanation

Y turns limewater milky, so it is CO2. Z turns white anhydrous copper (II) sulphate blue, so it is water vapour.