Question

why are there different colours of flame? give reason
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Answer 1

When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission .

Answer 2

$\huge\mathfrak\purple{Mr Phenomenal}$


The main factor that determines flame color is the chemical makeup of the flame. This, of course, depends on what is burning (that, is what is making the flame.) Temperature can be factor too, depending on what is in the flame.

In theory, a hydrogen flame has no color at all. Perfectly pure hydrogen burning in totally clean air does not make a visible flame. In practice, minor impurities make the flame appear as a faint, slightly blue flicker.

Some materials burn with a visible, but pale flame. Common alcohols (like methanol and ethanol) burn with a pale blue flame.

The majority of ordinary flammable substances such as wood, paper, oils, waxes, resins, hydrocarbon fuels, etc, burn with bright luminous flames that vary in color between yellow and reddish orange. These flame colors are due to carbon particles in the flame. (You could think of this as millions and millions of microscopic glowing coals.)