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Q.

On dissolving 10.8 g of glucose (m.w. = 180) in 240 g of water, its boiling point increases by 0.13° .  Then, the molal elevation constant of water is

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a

0.42°

b

0.52°

c

0.62°

d

0.72°

answer is B.

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Detailed Solution

The formula for elevation in boiling point of solution is

∆Tb=Kb×WBMB×1000WA

∴Kb=∆Tb×M×WAWB×1000

=0.13×18×24010.8×1000=0.52

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