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At room temperature, a dilute solution of urea is prepared by dissolving 0.60 of urea in 360 g of water. If the vapour pressure of pure water at this temperature is 35 mm Hg, lowering of vapour pressure will be. (molar mass of urea = 60 g mol –1 )

1. 0.031 mmHg
2. 0.017 mmHg
3. 0.028 mmHg
4. 0.027 mmHg

Correct answer: 0.017 mmHg

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