alleryAdding a non-volatile solute to a solvent makes its vapour pressure:
ADecrease
BIncrease
CStay same
DDouble up
Answer & Solution
Correct answer: A. Decrease
1. The solute particles occupy part of the surface.
2. Fewer solvent molecules can escape from it.
3. So the vapour pressure of the solution decreases.
_Source: syllabus Chemistry Part I, Chapter 2, Solutions._
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