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Q.

A solution is obtained by dissolving 12 g of urea (mol. wt. 60) in a litre of water. Another solution is obtained by dissolving 68.4 g of cane sugar (mol. wt. 342) in a litre of water at the same temperature. The lowering of vapour pressure in the first solution is

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a

Same as that of 2nd solution

b

Nearly one-fifth of the 2nd solution

c

Double that of 2nd solution

d

Nearly five times that of 2nd solution

answer is A.

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Detailed Solution

We know that in the first solution number of the moles of urea= Mass of uream.wt. of urea×1V=1260×11=0.2 and, In second solution the number of moles of cane sugar =Mass of cane sugarm.wt. of cane sugar=68.4342×11=0.2

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