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NEET levelSingle correct optionDifficulty 1 of 3so215

Aqueous solutions of $NaCl$ , urea and $CaCl X_{2}$ of the same molality (complete dissociation of the salts) are compared. The correct order of increasing depression of freezing point is

Aurea $<$ $NaCl$ $<$ $CaCl X_{2}$
B $CaCl X_{2}$ $<$ $NaCl$ $<$ urea
C $NaCl$ $<$ urea $<$ $CaCl X_{2}$
Durea $<$ $CaCl X_{2}$ $<$ $NaCl$

Answer: A

Δ T_{f} = i K_{f} m

with the same

m

and

K_{f}

, so the order follows

i

. Urea has

i = 1

,

NaCl

has

i = 2

and

CaCl X_{2}

has

i = 3

. Hence urea

<

NaCl

<

CaCl X_{2}

.

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