Ques: Which compound used as matches in ancient Egypt?

Ans: small pieces of pinewood dipped in sulphur were used as matches in ancient Egypt.

Ques: What is the difference between the burning of a candle and the burning of a fuel like coal?

Ans: candle burns with a flame whereas coal does not.

Ques: The sun produces its own heat and light. Is it also some kind of combustion?

Ans: In the sun, heat and light are produced by nuclear reactions.

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