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JAMB Chemistry 1992 Question 32

Question 32

Hydrocarbons

Which of the following combination of gases is used for metal welding? I. Oxygen and ethyne. II. Hydrogen and ethyne III. Hydrogen and oxygen IV. Ethyne, hydrogen and oxygen

  1. A.I and II
  2. B.II and IV
  3. C.I and III
  4. D.II and IV
Show the answer and explanation

Answer: C (I and III)

Explanation

A welding flame needs a fuel burning in pure oxygen. The oxy-acetylene flame (I) and the oxy-hydrogen flame (III) are both used.