A flame is formed during burning of a substance due to ___ .

Fire could provide heat

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Fire could be used to cook food

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Fire provided a portable form of light and could protect from predators

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All the above options are correct.

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Solution

The correct option is D
All the above options are correct.

When a substance is being burned, a good portion of the burning material gets vapourised due to the energy being released during burning and the vapourised molecules then react with oxygen to release more heat and a flame is formed.

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