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JAMB Chemistry 1983 Question 3

Question 3

Hydrocarbons

The flame used by welders in cutting metals is

  1. A.butane gas flame
  2. B.acetylene flame
  3. C.kerosene flame
  4. D.oxy-acetylene flame
  5. E.oxygen flame
Show the answer and explanation

Answer: D (oxy-acetylene flame)

Explanation

Ethyne (acetylene) burnt in pure oxygen gives a flame of about 3000°C, hot enough to cut and weld metals.