First slide

Theory of dilute solutions

Question

Lowering in vapour pressure is highest for

Moderate

A

0.2 m urea
B

0.1 m glucose
C

0.1 m MgSO₄
D

0.1 m BaCI₂

Solution

Barium Chloride on dissociation gives 2 moles of Chloride ions and one mole of Barium ions so the total number of moles of ions in solution is 2+1=3.0, Higher is the van't Hoff factor greater will be the lowering of vapour pressure.
The value of P $°$ - P_S is maximum for BaCl₂.

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