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Q.

The vapour pressure of water at 20° C is 17 .5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20° C, the vapour pressure of the resulting solution will be :

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a

17.675 mm Hg

b

15.750 mm Hg

c

16.500 mm Hg

d

17.325 mm Hg

answer is C.

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Detailed Solution

Here,

P0−PsPs=Xsolute 

Put the known values,

17.5−PsPs=0.11017.5−PsPs=0.01⇒Ps=17.325 mm Hg

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