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Q.

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water, is [Given : Molar mass of A = 93 g mol–1. Molal depression constant of water is 1.86 K kg mol–1]

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a

50 %

b

60 %

c

70 %

d

80 %

answer is D.

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Detailed Solution

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 ΔT=ikf×m 0.2=i×1.86×0.793×100042 i=0.2×93×61.86×100 i=0.60 2A ⇌A2 1−α i=1−α2 i=1−α2 1−α2=0.60 1−0.60=α2 α=0.80

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