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Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of the Al₂(SO₄)₃ (if all are 100% ionised)?

1. K₃[Fe(CN)₆]
2. Al(NO₃)₃
3. K₄[Fe(CN)₆]
4. K₂SO₄

Correct answer: K₃[Fe(CN)₆]

Solution

Al₂(SO₄)₃ dissociates into 5 ions (2Al³⁺ and 3SO₄²⁻). Similarly, K₃[Fe(CN)₆] dissociates into 4K⁺ and 1 [Fe(CN)₆]³⁻, giving a total of 5 ions. Thus, their van't Hoff factors are the same.

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