Goldsmiths blow the outermost zone of flame with a blow-pipe for melti – McqOptions

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1.	Goldsmiths blow the outermost zone of flame with a blow-pipe for melting gold and silver. Why do they use the outermost zone?
A.	It is the zone of incomplete combustion and is least hot.
B.	It is the zone of complete combustion and is the hottest zone.
C.	It is the least hot zone and complete combustion takes place in this zone.
D.	It is the hottest zone though incomplete combustion takes place in this zone.
Answer» C. It is the least hot zone and complete combustion takes place in this zone.

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