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Effect on Indicators by Acids and Bases

What colour f...

Question

What colour flame is seen when bituminous coal is burnt?

A

Blue

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B

Yellow

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C

Red

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D

Green

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Solution

The correct option is B Yellow
The yellow colour flame is seen when bituminous coal is burnt due to incandescence of very fine soot particles that are produced in the flame. This type of flame only burns at around 1,000 °C. Depending on the lighting, you may have actually seen the soot rising from the flame.

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