Q.

The molal freezing point constant for water is 1.86 K.kg mole-1. The freezing point of 0.1m NaCl solution is

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a

– 0.186°C

b

0.372°C

c

– 0.372°C

d

– 1.86°C

answer is B.

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Detailed Solution

Assuming that NaCl is completely ionised, i=2

\large \therefore \Delta T_f=ik_fm=2(1.86)(0.1)=0.372^oc

FP of sol. = 0-0.372 = - 0.372oc

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