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The figure below shows the different zones of a candle flame.  Which zone of the flame is the HOTTEST?
AThe dark zone (near the wick)
BThe luminous (yellow) zone
CThe non-luminous (outermost) zone, where complete combustion takes place
DEvery zone is at the same temperature
Answer & Solution
Correct answer: C. The non-luminous (outermost) zone, where complete combustion takes place
A candle flame has three zones — dark (innermost, lowest temperature, unburnt vapours), luminous (yellow, partial combustion, glowing carbon particles giving the colour), and non-luminous (outermost, complete combustion, hottest, blue and nearly invisible). Goldsmiths use the outermost zone to melt gold and silver.
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