Explanation:
Physical changes are the changes that does not lead to any change in chemical composition of a substance.
For example, mass, density, volume are all physical changes.
On the other hand, a change that leads to formation of a new compound by changing the chemical composition of reactants or combining atoms is known as a chemical change.
For example, combustion, toxicity, reactivity etc are all chemical changes.
Therefore, given changes are identified as follows.
Answer:
(a) coal burning: chemical change
(b) ice melting: physical change
(c) mixing chocolate syrup with milk : physical change
(d) explosion of a firecracker: chemical change
(e) magnetizing of a screwdriver: physical change
