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Solute A associates in water. When 0.7 g...

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 Question: `1.86 "K kg mol"^(-1)`]

A

`50%`

B

`60%`

C

`70%`

D

`80%`

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