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Question

What is the relative lowering in vapour pressure of 10% aqueous solution of glucose :

A
1/10
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B
1/90
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C
1/20
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D
1/30
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Solution

The correct option is C 1/90
10% aqueous solution of glucose

10 gm glucose in 100 gm solution

so H2O will be 90 gm

nglucose=10180=118

nH2O=9018=5

Xglucose=1185+118=190

so ΔPPOsolv=Xglucose

=190
Hence, the correct option is B

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