Q.

Lowering in vapour pressure is highest for

Moderate

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0.2 m urea

0.1 m glucose

0.1 m MgSO4

0.1 m BaCI2

answer is 4.

(Detailed Solution Below)

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Detailed 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°- PS is maximum for BaCl2.

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