Question

Statement I: Melting is a physical change as the melted wax can again be obtained as solid wax upon cooling
Statement II: Burning of wax is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form.

Which of the following option is correct?

• A. Statement I:- True Statement II:- False
• B. Statement I:- True Statement II:- True
• C. Statement I:- False Statement II:- False
• D. Statement I:- False Statement II:- True

Answer 1

The correct option is B

Statement I:- True

Statement II:- True

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 is a physical change as only the state of wax is changed from solid to liquid and it can again be brought back to its initial state i.e. solid.

Chemical change:- In a chemical change, a new substance with entirely different properties is formed. Burning of wax produces carbon dioxide ($C{O}_2$) and moisture ($H_{2}O$) and hence it is a chemical change.

So both the statements are true.