Q. Which of the following has been arranged in order of decreasing freezing point (All aqueous solution):-

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$0.05MNaNO_{3}>0.04MCaCl2>0.140Murea>0.075CuCO_{3}$

$0.04MBaCl_{2}>0.140MGlucose>0.075CuCO_{3}>0.05MNaNO_{3}$

$0.075MCuSO_{4}>0.140Msucrose>0.04MBaCl_{2}>0.05MKNO_{3}$

$0.075CuSO_{4}>0.05MKNO_{3}>0.04MCaCl_{2}>0.1414glucose$

Solution:

$Freezingpoint \propto \frac{1}{\text{ colligative property }}$
$\text{i \times C}$
$NaNO_{3}$ or $KNO_{3}=0.05\times 2=0.1$
$CaCl_{2}$ or $BaCl_{2}=0.04\times 3=0.12$
Urea or Glucose or sucrose $=0.14\times 1=0.14$ .

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