Physical & Chemical States — Homi Bhabha Exam Chemistry MCQs with Solutions
Free Homi Bhabha Exam Chemistry Physical & Chemical States MCQs with step-by-step solutions (6 questions). Part of Matter & Its States. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Physical & Chemical States · medium · theory
A change in which no new substance is formed and which is usually reversible is a:
A. chemical change
B. nuclear change
C. combustion
D. physical change ✓ Correct
Solution: Physical changes (e.g. melting, dissolving) form no new substance and are often reversible.
Q2 — Physical & Chemical States · medium · theory
The rusting of iron is an example of a:
A. physical change
B. reversible change
C. chemical change ✓ Correct
D. change of state only
Solution: Rusting forms a new substance (iron oxide), so it is a chemical change.
Q3 — Physical & Chemical States · hard · theory
Which of the following is a chemical change?
A. Burning of paper ✓ Correct
B. Breaking a glass
C. Dissolving salt in water
D. Melting of wax
Solution: Burning produces new substances (ash, gases) and is a chemical change; the others are physical.
Q4 — Physical & Chemical States · medium · theory
Melting of ice into water is a physical change because:
A. no new substance is formed and it can be reversed by freezing ✓ Correct
B. a new substance (water) is created
C. it is irreversible
D. it releases a gas
Solution: Ice and water are the same substance in different states; freezing reverses the change.
Q5 — Physical & Chemical States · hard · theory
Which set contains ONLY chemical changes?
A. Freezing water, evaporating water, crushing a can
B. Tearing paper, breaking chalk, melting wax
C. Melting of ice, boiling of water, dissolving sugar
D. Burning of coal, souring of milk, rusting of iron ✓ Correct
Solution: Burning, souring and rusting all form new substances (chemical changes); the others are physical.
Q6 — Physical & Chemical States · medium · theory
Dissolving common salt in water is considered a physical change because:
A. a new compound is formed
B. the salt can be recovered by evaporation ✓ Correct
C. a gas is released
D. the change is irreversible
Solution: No new substance forms; evaporating the water recovers the original salt, so it is physical.