CDS Chemistry
Physical Chemical Changes — Quiz
20 Questions · No Negative Marking
Question 1
Which of the following is a PHYSICAL change?
ABurning of paper — new substances (CO2, H2O, ash) are formed
BRusting of iron — iron oxide (Fe2O3) is a new substance
CDissolving sugar in water — no new substance; sugar can be recovered by evaporation
DSouring of milk — lactic acid is formed by bacterial action
Question 2
A chemical change can be identified by which of the following observations?
AChange in size or shape of the substance
BChange in state (solid to liquid to gas)
CFormation of a new substance with different properties
DMixing of two substances without reaction
Question 3
Melting of ice is classified as a physical change because:
AEnergy is absorbed during the process, proving a new substance must form
BA new substance (liquid water) is produced with completely different properties
CNo new substance is formed — H₂O remains H₂O and the change is reversible
DThe change is irreversible since frozen water cannot be re-frozen once melted
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