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Question

When we burn a candle, which of the following changes occur?
  1. Physical Change
  2. Both Physical and Chemical
  3. Neither Physical nor Chemical
  4. Chemical Change


Solution

The correct option is B Both Physical and Chemical
Both Physical and Chemical changes occur.
Upon heating, the wax first undergoes the process of melting followed by heating. Here, melting is a physical change as the melted wax can again be obtained as solid wax upon the removal of heat, whereas, burning is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form. 

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