Question

During the burning of a candle. different zones of combustion in the flame are listed below:
A. Outermost zone
B. Innermost zone
C. Middle zone
The correct order of temperature of zones is :
A. A>B>C
B. C>B>A
C. B>C>A
D. A>C>B

Answer 1

Hint The visible, gaseous element of a fire is called a flame. A very exothermic chemical reaction occurring in a thin zone causes it. Very hot flames have ionised gaseous components of sufficient density to be classified as plasma.

Complete answer:
A candle flame is divided into three zones. The temperatures in each zone are varied. Each zone has a different colour, which will aid us in determining the temperatures in each zone.
-The Outer Zone is the first of the three zones.
-The Middle Zone is the second zone.
-The Inner Zone is the third zone.
The outer zone is blue due to complete combustion. When compared to the other zones, this one has the highest temperature. The non-luminous section of the flame is this blue zone.
The centre zone is the yellow-colored section that is the brightest part of the flame. It's moderately hot, and the gasoline is just partially burned. The innermost part of the flame is the hottest. Due to the existence of unburned wax vapours, the inner zone is black.
So, concluding it we can say:
-The outermost zone, which is blue in colour, is the warmest of the three.
-The middle zone is golden in colour and moderately heated.
-The hottest zone is the innermost, which is black in colour.

So, the correct order is option D.

Note: The incandescence of very small soot particles generated inside the blaze causes the blue flame. With increased oxygen supply, less black body-radiating soot is produced, and the process produces enough energy to excite and ionise gas molecules in the flame, giving the flame a blue colour.