The blue zone in a LPG flame indicates _________.

unburnt vapours

No worries! We‘ve got your back. Try BYJU‘S free classes today!

partial decomposition

No worries! We‘ve got your back. Try BYJU‘S free classes today!

moderately hot

No worries! We‘ve got your back. Try BYJU‘S free classes today!

hottest and complete combustion

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D hottest and complete combustion
Flame color determines the rate of combustion and thus the temperature difference producing a different color flame. In LPG the blue zone is the zone of complete combustion of fuel. So, the amount of soot decreases, and the temperature is highest as high heat is released.

Suggest Corrections

Column A	Column B	Column C
(a) Hottest part	(i) Innermost zone of unburnt wax vapors	(x) blue
(b) Moderately hot	(ii) Middle zone of partial combustion	(y) black
(c) Least hot	(iii) Outer zone of complete combustion	(z) yellow

	Column I		Column II
(a)	Hottest zone of a candle flame	(i)	Zone of unburnt wax vapours
(b)	Yellow zone of a candle flame	(ii)	Non-luminous zone
(c)	Black innermost zone of the candle flame	(iii)	Incomplete combustion zone