Question

Match column 'A' with column 'B', concerning the characteristics of a flame and its zones.

'A'	'B'
a. Dark inner zone	1. Hottest part (No carbon)
b. Blue zone	2. Partial combustion
c. Luminous zone	3. Unburnt vapours of wax
d. Non-luminous zone	4. Complete combustion

• A. a -1, b - 2, c - 3, d - 4
• B. a - 2, b - 3, c - 4, d - 1
• C. a - 3, b - 4, c - 2, d - 1
• D. a - 4, b - 1, c - 2, d - 3

Answer 1

The correct option is C a - 3, b - 4, c - 2, d - 1

1. Dark zone: The dark zone is the area around the wick of the candle flame that consists of unburnt wax vapour. It is the least hot of all the four zones.

2. Luminous zone: This part of the flame is the region where incomplete combustion takes place. This part of the candle flame has a yellowish flame.

3. Non-Luminous zone: The non-luminous zone is the region of complete combustion and also the hottest part of the flame.

4. Blue zone: This is due to the combustion of carbon monoxide, produced by the incomplete combustion of carbon particles in wax.