Unburnt carbon particles are present in the:

Blue zone

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Dark inner zone

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Luminous zone

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Non-luminous zone

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Solution

The correct option is C Luminous zone
The circular dark ring is formed on the slide is due to the deposition of unburnt carbon particles present (middle) in the luminous zone of the candle.

Option C is correct.

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Similar questions

Unburnt carbon particles cause-

	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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