A 0 . 5 percent solution of potassium chloride was found to freeze at - 0 . 24   ° C . The…

A 0.5 percent solution of potassium chloride was found to freeze at -0.24 °C. The percentage dissociation of potassium chloride is (Nearest integer)
(Molal depression constant for water is 1.80 K kg mol-1 and molar mass of KCl is 74.6 g mol-1)

Solution

KCl→K++Cl-

1      -      -

1-α     α      α

i=1-α+2α=1+α

∆Tf=i Kf·m

0.24=1+α1.80×0.574.6×100099.5

α=0.98α%=98 %

Asked in: JEE Main 2022 (26 Jun Shift 1)

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