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QJEEM22Ch88c2: JEE Main 2022 Chemistry - Class 12 JEEM22Ch88c2 Solution: A 0.5 percent solution of potassium chloride was found to…

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)

Step-by-Step Verified Solution

ΔTf=iKbm\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{iK}_{\mathrm{b}} \mathrm{m}

i=0.24×99.5×74.61.80×0.5×1000=1.98α=i−1n−1=0.981=0.98=98%

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