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JAMB Chemistry 1982 Question 35

Question 35

Hydrocarbons

Water is poured over a white solid and a colourless neutral gas is evolved which burns with a sooty flame. The white solid is

  1. A.calcium
  2. B.calcium oxide
  3. C.calcium carbide
  4. D.sodium peroxide
  5. E.sodium sulphate
Show the answer and explanation

Answer: C (calcium carbide)

Explanation

Calcium carbide and water give ethyne (acetylene), a neutral gas with a high carbon content that burns with a sooty flame.