25. When a glass slide is introduced into the luminous zone of the candle flame, a greyish
black coloured circular ring is produced,
this happens due to
(a) Unburnt carbon particles are formed in the luminous zone
(b) Complete combustion takes place in the luminous zone
(c) The temperature of the luminous zone is very high
(d) All of these
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A) unburng carbon particles
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