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Question

One of the phenomenon which cannot be described as combustion is:
  1. oxidation of coal in air
  2. lighting of an electric lamp
  3. reaction of antimony in chlorine
  4. burning of magnesium in nitrogen

A
burning of magnesium in nitrogen
B
oxidation of coal in air
C
lighting of an electric lamp
D
reaction of antimony in chlorine
Solution
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Lighting of an electric lamp cannot be described as combustion. During the lighting of an electric lamp, the electrical energy is converted into light energy. However, during combustion, chemical energy is converted into thermal energy.

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