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Zones of Candle Flame

A wax candle ...

Question

A wax candle burns with yellow flame. Give reason.

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Solution

Candle burns with a yellow flame because of burning of low energy fuel in a low oxygen content. The incomplete combustion of wax produces small unburnt carbon particles which rise in flame, get heated and give yellow and luminous flame.

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Q. Middle zone of a candle falme burns with a yellow flame.

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(a) coal
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Q. Which region of the flame of a burning candle has incomplete combustion of wax?

Q. Assertion :The burning of a candle is both a physical and a chemical change. Reason: Burning of candle melts the wax and hence physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.

Q. Match Column I with Column II and select the correct option from the codes given below.

	Column I		Column II
(a)	Hottest zone of a candle flame	(i)	Zone of unburnt wax vapours
(b)	Yellow zone of a candle flame	(ii)	Non-luminous zone
(c)	Black innermost zone of the candle flame	(iii)	Incomplete combustion zone

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