Of the following four aqueous solutions, total number of those solutions whose freezing point is...

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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)
(a) \( 0.10 \mathrm{M} \mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2} \)
(b) \( 0.10 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(c) \( 0.10 \mathrm{M} \mathrm{KCl} \)
(d) \( 0.10 \mathrm{M} \mathrm{Li}_{3} \mathrm{PO}_{4} \)
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