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Which one of the following salts will have the same value of van’t Hoff factor (i) as that of K4[Fe(CN)6]?

1. Al2(SO4)3
2. NaCl
3. Al(NO3)3
4. Na2SO4

Correct answer: Al2(SO4)3

Solution

K4[Fe(CN)6] dissociates into 5 ions (4K+ and [Fe(CN)6]4−). Al2(SO4)3 also dissociates into 5 ions (2Al3+ and 3SO42−), so they have the same van’t Hoff factor.

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