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Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, if depresses the freezing point by 0.2ºC. 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 .]

1. 50%
2. 60%
3. 70%
4. 80%

Correct answer: 80%

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