In the burning of a candle, the wax melts (physical change) and turns into liquid. This liquid wax is then drawn up the wick, vaporizes, and reacts with oxygen in the air (combustion), producing carbon dioxide, water vapor, heat, and light (chemical change). Thus, both physical (melting/vaporization of wax) and chemical (combustion of wax vapor) changes occur simultaneously as the candle burns.
In which one of the following cases do both physical and chemical changes take place?
Asked in UPSC CDS 2 2023 · Topic: Physical and Chemical Changes, Solution (Distinction between Physical and Chemical Changes)
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