Question

Why some substances burn with a blue flame and yellow flame​

Answer 1

Answer Is = Due to incandescence of very fine soot particles that are produced in the flame. With increasing oxygen supply, less black body-radiating soot is produced due to a more complete combustion and the reaction creates enough energy to excite and ionize gas molecules in the flame, leading to a blue appearance.

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Answer 2

Substances having higher carbon content burn with blue flame and leave no residue while

Substances having low carbon content burn with yellow flame