Different zones of a candle flame are marked by the letters P, Q, R and S.

Which of the following statements are correct ?
(i) P is the luminous zone and is the hottest part of candle flame
(ii) In zone Q, there is inadequate supply of oxygen.
(iii) Zone R contains unburnt wax vapours produced by melting of wax.
(iv) In S zone, carbon monoxide burns with a blue flame.

Options

A. (i) and (ii) only
B. (ii), (iii) and (iv) only
C. (ii) and (iv) only
D. (i), (ii) and (iii) only

Answer

B

Explanation

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