Which of the following flames is produced by a candle?

Green flame

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Non-luminous flame(blue)

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Light giving flame

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Yellow luminous flame

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Solution

The correct options are
A Non-luminous flame(blue)
C Yellow luminous flame
There are two types of flame that is produced by candle:
(a) Luminous flame (b) Non-luminous flame
Non-luminous flame is a result of complete combustion and is blue in colour.
Luminous flame is a result of incomplete combustion and is yellow bright in colour.
Hence option $B$ and $D$ are correct.

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Which of the following burns by producing a yellow, luminous flame ?
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(a) Make a labelled diagram of a candle flame:

(b) What makes the middle zone of a candle flame luminous (or light-giving) ?

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