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# Of the following four aqueous solutions,

Question:

Of the following four aqueous solutions, total number of those solutions whose freezing point is lower than that of $0.10 \mathrm{M} \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ is (Integer answer)

1. $0.10 \mathrm{M} \mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}$

2. $0.10 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4}$

3. $0.10 \mathrm{M} \mathrm{KCl}$

4. $0.10 \mathrm{M} \mathrm{Li}_{3} \mathrm{PO}_{4}$

Correct Option: , 4

Solution:

As $0.1 \mathrm{M} \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ is non-dissociative and rest all salt given are electrolyte so in each case effective molarity $>0.1$ so each will have lower freezing point.