_______ colour zone of a candle flame is used by a goldsmith for melting gold and silver.

Blue

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Yellow

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Black

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White

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Solution

The correct option is A Blue
A candle flame has three zones. These are inner zone, outer zone and middle zone.
A goldsmith uses the outer zone of a candle flame to melt gold and silver. The outer zone is blue in colour as it is the hottest zone. Complete combustion takes place in the outermost zone of the flame. Hence, it has a very high temperature.

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