Question

Which is the hottest part of Bunsen flame?
A: In the blue zone
B: Just above the tip of the primary flame
C: At the top of the primary core
D: Just above the inner core

Answer 1

Hint: A Bunsen burner is basically a gas burner which is generally employed as a laboratory equipment for burning, heating and sterilising the materials at lab-scale. The gas may be liquefied petroleum gas or natural gas such as butane, propane, or a mixture.

Complete Step by step answer:
There are mainly two types of flame produced in a Bunsen burner which are yellow flame and blue flame. The yellow flame, known as the safety flame, is considered to be the coolest Bunsen flame as the air hole is covered and less oxygen will burn with the gas which means that the flame will not burn efficiently. On the other hand blue flame, known as heating flame, is the hottest Bunsen flame as the air hole is uncovered and more oxygen will burn with the gas which means that the flame will burn efficiently.

The blue flame comprises two parts i.e. a smaller and brighter section at the bottom (region of complete combustion) and a larger and less bright section (region of incomplete combustion) above as shown in the figure. Thus, the hottest part of the Bunsen flame is just above the tip of the smaller,
brighter section or primary flame where the temperature can reach about $1500^\circ C$.

Hence, the correct answer is Option B.

Note: Always follow the correct procedure to light a Bunsen burner:
-Wear the correct safety gear.
-Turn the gas tap on only when a lit match is above the barrel.
-Light a Bunsen burner with the collar closed.
-Extinguish a Bunsen burner flame always by turning off the gas tap.