The conclusion is that chloride does not emit light in visible range.
As per the image, we can see the differentiating factors are the metal ions. With different metals, the chloride salt gives different flame colour.
As we know, all the electrons absorb energy and emit it while returning from excited state to ground state. The wavelength of this emitted energy is perceived by us as colours.We can state that these colours are of metals and chloride ions themself do not emit colour in visible range.
Also, metal salts of chlorine are volatile. The metal chloride vapourises quickly and hence is suitable for the detection of metal ions.
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The image is attached in the diagram..
