Molality is defined as the number of moles of solute per kilogram of solvent. In

Question

Molality is defined as the number of moles of solute per kilogram of solvent. In dilute aqueous solutions of electrolytes, the greater the number of particles produced by the electrolyte per kilogram of water, the lower the freezing point of the solution. The freezing points of dilute aqueous solutions of equal molality of the two electrolytes in which of the following pairs would be most different from each other?

A. K2SO4 and CoI2

B. AgClO4 and Ni(NO3)2

C. LiBr and Al2(SO4)3

D. MgCl2 and ZnSO4

Explanation / Answer

answer : C. LiBr and Al2(SO4)3

LiBr --------------> Li+ + Br-

it gives only 2 ions

Al2(SO4)3 ---------------> 2 Al+3 + 3 SO4 -2

it gives 5 ions

so the difference is more.

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