Question

The______zone of flame is the hottest

Answer 1

Answer:

outermost zone

Answer: A goldsmith uses the outermost zone of a flame, which is non-luminous, to melt gold and silver as it is the hottest zone of the flame, having more temperature. Inner zone; The outermost zone is the hottest among all zones and is blue in color, and this is due to complete combustion

Answer 2

Due to complete combustion, the outer zone is blue. This zone is the hottest in temperature when compared to the other zones. This blue coloured zone is the non-luminous part of the flame.