Q. What is hottest part of the gas flame is called?

A
Yellow zone
B
luminous zone
C
dark zone
D
non-luminous zone
Solution:

A non-luminous flame undergoes complete combustion as it draws much more oxygen and gets much hotter. There are several “zones” within a non-luminous flame, and each zone has a different temperature. The outermost zone of the flame is blue in colour and it is the hottest part.

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