Exercise condition:

6
Read the options and select the best one:
1. Assertion (A): Bursting a firecracker is a physical change.
Reason (R): A physical change can be a reversible change.

2. Assertion (A): Melting of gold is a physical change because no new substance is formed in it.
Reason (R): On cooling the melted gold, it returns to its original state.
3. Assertion (A): A very hot glass shown under cold water got cracked due to expansion of the glass surface.
Reason (R): A very hot glass shown under cold water got cracked due to contraction of the glass surface.
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