The _____ colour of the flame indicates complete combustion of LPG.

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yellow

red

orange

blue

answer is D.

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Detailed Solution

On complete combustion of LPG blue flame is produced.

The blue colour of the flame indicates the complete combustion of LPG, which results in the formation of carbon dioxide. Incomplete combustion of the LPG results in hazardous carbon monoxide and burns with a yellow flame.

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