The blue zone in an LPG flame indicates:

no combustion

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partial combustion

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complete combustion

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none of the above

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Solution

The correct option is C complete combustion
Flame colour helps in determining the changes taking place in the particular region of the flame. In the blue zone, complete combustion of fuel takes place. So, the amount of soot decreases, and the temperature is highest.
Hence, the correct option is C.

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