54. At room temperature a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360g of water. If the vapour pressure of pure water at this temperature is 35mmHg, lowering of vapour pressure will be
a. 0.027 mmHg
b. 0.028 mmHg
c. 0.017mmHg
d. 0.031 mmHg
Ans. c
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