Flames of different substances __________ colours.

will not have different

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will have same

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may have different

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do not have any

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Solution

The correct option is C
may have different

Flame colour may be different for different substances because on burning they emit waves of different wavelength due to differences in their atomic structures. This is actually a characterstic property of materials. For example, sodium on burning emits a yellow flame while potassium emits a lilac flame. This property is utilized in flame tests to determine the elemental composition of materials.

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(a) What is a flame? What type of substances, on burning, give a flame?

(b) What is the difference between the burning of a candle and the burning of a fuel like coal ?

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