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02/10/2020 11:06 am
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Which of the following 0.10 m aqueous solutions will have the lowest freezing point?
(a) Al2(SO4)3
(b) C6H12O6
(c) KCl
(d) C12H22O11
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02/10/2020 11:13 am
(a) Al2(SO4)3
Explanation:
Depression in freezing point ∝ No. of particles.
(when concentration of different solutions is equal)
Al2(SO4)3 provides five ions on ionisation
Al2(SO4)3 → 2Al3+ + 3SO2-4
while KCl provides two ions
KCl 3/4 → K+ + Cl-
C6H12O6 and C12H22O11 are not ionised
so they have single particle in solution.
Hence, Al2(SO4)3 have maximum value of depression in freezing point or lowest freezing point.