When a substance undergoes a change in its physical properties, it is called:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Physical change
A physical change alters only the physical properties of a substance, such as its shape, size, state or colour; no new substance is formed, and the change can often be reversed. Melting of ice, dissolving salt in water and tearing paper are examples.
In a chemical change, by contrast, the substance turns into new substances with different properties, as when iron rusts or wood burns.