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Q.

Which has greater lowering of vapour pressure

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a

0.1m Urea

b

0.1m Sucrose

c

0.1m Glucose

d

equal in all cases

answer is D.

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Detailed Solution

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As the number of particles increases , the vapor pressure decreases. 

Glucose ,urea and sucrose being non-electrolytes, their Van't Hoff factor  = 1 .

equimolal solutions of these solutions will have same vapour pressure. 

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