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Question

Which of the following statement is correct?


A

Melting is a chemical change because the melted wax can again be obtained as solid wax upon cooling.

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B

Burning of wax is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form.

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C

Cutting of trees is a chemical change as it gives new products with different composition.

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D
Combustion of fuel is a physical change as the fuel can be reobtained from the gases liberated.
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Solution

The correct option is B

Burning of wax is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form.


Physical change:-

  • In a physical change no new substance is formed and the chemical composition of substance remains the same.
  • There are changes in physical properties like shape, size, appearance etc.
  • So melting of wax and cutting of trees are examples of physical change.

Chemical change:-

  • In a chemical change, new substances with entirely different properties are formed.
  • Burning of wax and combustion of fuel produce CO2 and H2O.
  • These are irreversible in nature.
  • Hence, these are examples of chemical change.

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