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 vapours	x. Blue
b. Moderately hot	ii. Middle zone of partial combustion	y. Black
c. Least hot	iii. Outer zone of complete combustion	z. Yellow

A) a. – i. - x, b. – ii. – z, c. – iii. - y
B) a. – iii. – x, b. – ii. – y, c. – i. - z
C) a. – iii. – y, b. – ii. – z, c. – i. - x
D) a. – iii. – x, b. – ii. – z, c. – i. - y

Answer 1

Hint The answer to this question is based on the general laboratory experiment of chemistry where the appearance of flame colour in three different zones by observation of candle would lead you to the required answer.

Complete step – by – step answer:
In the lower classes, we have studied about very basic concept of chemistry while experimenting in the lab that is about the flame of the candle and its parts.
We shall now recall those parts of a candle and match the following with the correct answers.
- Usually a candle flame has three zones in it and these zones can be observed by seeing through the eyes. Each of these zones have different temperatures and also have different colours.
- The first zone is called the outer zone and the second zone is called the middle zone and the third zone is called the inner zone.
- Because of the complete combustion, the outer zone is blue in colour and therefore this zone is the hottest zone.
- The middle part is the partial combustion zone and is yellow in colour and this part is moderately hot.
- The inner zone is also called as the dark zone which has the least hot unburnt vapours of the combustible material that is the wax part and thus is black in colour and therefore it is known as dark zone.

Thus, based on all these above facts, we can say that the correct answer is option C)

Note: Note that the blue coloured flame of the outer zone which is the hottest part is the non – luminous part of the flame which means that it is the part of flame which has access to as much oxygen as they could possibly use so that they can burn efficiently.