The solution with highest vapour pressure of the following is

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0.2 m sucrose

0.15 m sodium chloride

0.125 m sodium sulphate

0.3 m urea

answer is A.

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Detailed Solution

Effective concentrations; 0.2m sucrose(0.2m×1); 0.15m NaCl(0.15m×2); 0.125m Na2SO4(0.125m×3); 0.3m urea (0.3m×1); LVP ∝molality; VP of 3<2=4<1

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