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Question

Colour of the flame is dependent on the ______________.
  1. Nature of fuel
  2. Supply of oxygen
  3. All of the above
  4. Ignition temperature of the fuel

A
Nature of fuel
B
Ignition temperature of the fuel
C
Supply of oxygen
D
All of the above
Solution
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The color and temperature of a flame are dependent on the nature of the fuel involved in the combustion.
When excited, every element can emit light at a specific wavelength, hence the color of the emitted light is characteristic of each element. An example of this is the blue flame from gas ovens, which is due to the combustion of methane or liquified petroleum gas.

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