Reversible & Irreversible Changes — Homi Bhabha Class 6 Chemistry MCQs with Solutions
Free Homi Bhabha Class 6 Chemistry Reversible & Irreversible Changes MCQs with step-by-step solutions (10 questions). Part of Properties of Matter & Changes Around Us. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Reversible & Irreversible Changes · easy · theory
A change that can be undone to get back the original thing is called a …
A. Irreversible change
B. Reversible change ✓ Correct
C. Fast change
D. Chemical change
Solution: A reversible change can be undone to get the original substance back.
Q2 — Reversible & Irreversible Changes · easy · theory
A change that cannot be undone is called an …
A. Reversible change
B. Irreversible change ✓ Correct
C. Slow change
D. Easy change
Solution: An irreversible change cannot be undone; the original thing cannot be got back.
Q3 — Reversible & Irreversible Changes · easy · theory
Which of these is a reversible change?
A. Burning a matchstick
B. Melting an ice cube ✓ Correct
C. Baking a cake
D. Cooking an egg
Solution: Melted ice can be frozen back into ice, so melting is a reversible change.
Q4 — Reversible & Irreversible Changes · easy · theory
Which of these is an irreversible change?
A. Stretching a rubber band
B. Folding a paper
C. Freezing water
D. Burning a piece of wood ✓ Correct
Solution: Once wood is burnt into ash and smoke, it cannot be turned back, so burning is irreversible.
Q5 — Reversible & Irreversible Changes · medium · theory
Making curd (dahi) from milk is a change that is …
A. Easy to undo
B. Reversible
C. Only a shape change
D. Irreversible ✓ Correct
Solution: Once milk becomes curd, the curd cannot be turned back into milk, so it is an irreversible change.
Q6 — Reversible & Irreversible Changes · medium · theory
Water can be frozen into ice, and that ice can be melted back into water. This shows that freezing water is a …
A. Burning change
B. Chemical change
C. Reversible change ✓ Correct
D. Irreversible change
Solution: Since ice can be melted back into water, freezing water is a reversible change.
Q7 — Reversible & Irreversible Changes · medium · theory
Which of these changes can be reversed?
A. Frying an egg
B. Boiling water into steam ✓ Correct
C. Burning paper into ash
D. Cooking raw rice
Solution: Steam can be cooled back into water, so boiling is reversible; the others cannot be undone.
Q8 — Reversible & Irreversible Changes · medium · theory
Shaping a lump of dough into a flat round and then rolling it back into a ball is a …
A. Cooking change
B. Chemical change
C. Reversible change ✓ Correct
D. Irreversible change
Solution: The dough only changes shape and can be shaped back, so it is a reversible change.
Q9 — Reversible & Irreversible Changes · hard · theory
Which group contains only irreversible changes?
A. Burning wood, cooking food, rusting of iron ✓ Correct
B. Melting ice, boiling water, freezing water
C. Freezing water, melting butter, blowing a balloon
D. Folding paper, stretching a spring, melting wax
Solution: Burning wood, cooking food and rusting of iron all form new substances that cannot be turned back, so all three are irreversible.
Q10 — Reversible & Irreversible Changes · hard · theory
Why is the burning of paper called an irreversible change?
A. Because paper is very thin
B. Because the paper only changes colour
C. Because burning is very fast
D. Because the ash and smoke cannot be turned back into paper ✓ Correct
Solution: Burning paper makes ash and smoke, which can never be turned back into the original paper, so it is irreversible.