Which one of the following 0.06 M aqueous solutions has lowest freezing point?
Show Hint
- \(\mathrm{Al_2(SO_4)_3}\)
- \(\mathrm{C_6H_{12}O_6}\)
- KI
- \(\mathrm{K_2SO_4}\)
The Correct Option is A
Solution and Explanation
\(\mathrm{Al_2(SO_4)_3}\to 2Al^{3+} + 3SO_4^{2-}\): \(i = 5\).
KI: \(i = 2\); \(\mathrm{K_2SO_4}\): \(i = 3\); glucose: \(i = 1\) (non-electrolyte).
Largest \(i\) is for \(\mathrm{Al_2(SO_4)_3}\), so it has the largest depression and the lowest freezing point.
Answer: (1) \(\mathrm{Al_2(SO_4)_3}\)
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