25 mL of an aqueous solution of KCI was found to require 20 mL of 1 M AgNO3 solution when titrated using a K2CrO4 as indicator. The depression in freezing point of KCI solution with 100% ionization will be: [Kf = 2.0° C mol-1 kg and molarity = molality]

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5.0°C

3.2°C

1.6°C

0.8°C

answer is B.

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Detailed Solution

25×MKCI=20×1 MAgNO3 ∴ MKCI=0.8 ∆Tf=M'Kfi =0.8×2×2=3.2°

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