Lowering of vapour pressure is highest for

0.1M Urea

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0.1M BaCl₂

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0.1M MgSO₄

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0.1M Ethanol

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Solution

The correct option is B
0.1M BaCl₂

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.

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