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Model Paper 3 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 31 Mark
MCQ
Which one is a physical change?
  • A
    Mixing $BaSO_4 + NaCl$
  • B
    Mixing $\text{NH3}$ and $\text{HCI}$
  • C
    Burning magnesium in air
  • ✓
    Adding $\text{NaCl}$ to water
✓

Answer

Correct option: D.
Adding $\text{NaCl}$ to water
Adding of common salt $\text{(NaCl)}$ to water is physical change as no new substance is formed and no heat is evolved during the addition of salt in water. Also, salt can be obtained by evaporation.

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