Question

Match the following for the flame of a candle.​

Column A	Column B	Column C
(a) Hottest part	(i) Innermost zone of unburnt wax vapors	(x) blue
(b) Moderately hot	(ii) Middle zone of partial combustion	(y) black
(c) Least hot	(iii) Outer zone of complete combustion	(z) yellow

Answer 1

Due to complete combustion, the outer zone is blue. This zone is the hottest in comparison to the other zones. This blue-coloured zone is the non-luminous part of the flame.​
(a) hottest part - (iii) outer zone of complete combustion - (x) blue​
The yellow colour region which is the bright part of the flame is the middle zone. It is moderately hot and is due to partial combustion of fuel.​

(b) moderately hot - (ii) middle zone of partial combustion - (z) yellow​​
The least hot region of the flame is the inner zone. This inner zone is black due to the presence of unburnt wax vapors.​

(c) least hot - (i) innermost zone of unburnt wax vapours -(y) black​