Question

give reason with points why a wax candle burns with yellow flame​

Answer 1

candle flame are yellow because they are the result of burning low energy fuel in a low oxygen content, and so they are not very hot. ... The incomplete combustion of wax produces small unburnt carbon particles which rise in the flame, get heated and glow to give out yellow and luminous flame.

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Answer 2

First of all for any flange the most important factor determining color of the flame is oxygen supply and the extent of fuel-oxygen pre-mixing, which determines the rate of combustion and thus the temperature and reaction paths, thereby producing different color hues.

Now in case of a candle, it is an incomplete combustion and the flame temperature is not very high. This gives a yellow flame.

However if we take a highly-oxygenated gas, for example ethyne, the flame will be blue because of a complete combustion raising a very high temperature.

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