Which amongst the following substances can undergo both physical and chemical change simultaneously while burning?

Wood

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Petrol

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Candle

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Paper

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Solution

The correct option is C Candle
Wood, paper and petrol undergoes only chemical change as they burn completely and it cannot be reversed. But, the wax of a candle melts while it’s only the wick that burns completely. Thus, melting candle wax is a physical change while burning of its wick is chemical.

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