| Different zones of a candle flame are marked by the letters P, Q, R and S. |
|
| (i) P is the luminous zone and is the hottest part of candle flame. |
| (ii) In zone Q, there is inadequate supply of oxygen. |
| (in) Zone R contains unburnt wax vapours produced by melting of wax. |
| (iv) In S zone, carbon monoxide burns with a blue flame. |
A) (i) and (ii) only
B) (ii), (iii) and (iv) only
C) (ii) and (iv) only
D) (i), (ii) and (iii) only
Correct Answer: B
Solution :
P-Non-luminous zone, hottest part of the flame. Q - Luminous zone or zone of incomplete combustion due to inadequate supply of oxygen. R - Dark zone or zone of no combustion, covers the area surrounding the wick containing unburnt wax vapours produced by melting of wax. S - Blue zone, where carbon monoxide burns with a blue colour.
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