Of the following four aqueous solutions, the total number of those solutions whose freezing point is lower than that of $0 . 10{MC}_{2}{H}_{5}OH$ is (Integer answer)
(i) $0 . 10M{Ba}_{3}{\left({PO}_{4}\right)}_{2}$
(ii) $0 . 10M{Na}_{2}{SO}_{4}$
(iii) $0 . 10MKCl$
(iv) $0 . 10M{Li}_{3}{PO}_{4}$

Question

Of the following four aqueous solutions, the total number of those solutions whose freezing point is lower than that of

0 . 10{MC}_{2}{H}_{5}OH

is (Integer answer)
(i)

0 . 10M{Ba}_{3}{\left({PO}_{4}\right)}_{2}

(ii)

0 . 10M{Na}_{2}{SO}_{4}

(iii)

0 . 10MKCl

(iv)

0 . 10M{Li}_{3}{PO}_{4}

Quantrex Academy · Accepted Answer

Correct answer: 4

Δ T _ f = ik _ f m As m is the same for all solutions so Δ T _ f depends on Van't Hoff factor (i). Greater is i small is freezing point. cases Compound & i C _ 2 H _ 5 OH & 1 Ba _ 3 ( PO _ 4 ) _ 2 & 5 Na _ 2 SO _ 4 & 3 KCl & 2 Li _ 3 PO _ 4 & 4 cases So the given solutions have a lower freezing point than ethanol.

Of the following four aqueous solutions, the total number of those...

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