Q.
Which of the following solutions has the maximum freezing point?
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a
1 molar of NaCl solution
b
1 molar of KCl solution
c
1 molar of CaCl2 solution
d
1 molar of urea solution
answer is D.
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Detailed Solution
1 molar of urea solution has maximum freezing point.The depression in the freezing point is a colligative property and depends on the number of solute particles present in the solution. All the given solutions have same molarity. However, urea is non electrolyte . whereas NaCl, KCl and CaCl2 are electrolytes (dissociate in aqueous solution). Hence, 1 molar of urea solution gives least number of solute particles in a given amount of solvent. 1 molar of urea solution has lowest depression in the freezing point and maximum freezing point.
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