Addition of a non-volatile solute to a pure solvent ____________________?
Correct answer: B. Both B. and C.
- A. Increases its freezing point
- B. Both B. and C.
- C. Decreases its freezing point
- D. Increases its boiling point
Explanation
A nonvolatile solute lowers the solvent’s vapour pressure, so a higher temperature is needed to boil it and a lower temperature at which it freezes. Thus both boiling-point elevation and freezing-point depression occur.
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