Which among the following substances does not burn with a flame?

Camphor

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Candle

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Dry Grass

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Coal

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Solution

The correct option is D Coal
Substances produce flames while burning, only if it vapourises during the process. Camphor, candle and dry grass vaporise on heating. Thus, they produce flames.
Whereas, coal does not vapourise on burning. So, it does not produce flames.

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