The flames of different materials could be of different colours. This is due to

Hot air rises up

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Cold air rises up

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Hot air is dense

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It doesn't rise up.

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Solution

The correct option is A
Hot air rises up

Due to different atomic structure, when a substance burns, it emits light waves of different wavelengths which is characterstic property of the material being burned and thus different material give flame of different colours.

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