MHT CET 2026 Chemistry question

Calculate the van't Hoff factor of centimolar solution of potassium ferrocyanide if it is 60% dissociated at 300 K.

(A)3.4Correct
(B)3.9
(C)3.1
(D)3.7

Answer: (A)

Solution

Potassium ferrocyanide is and dissociates as K_4[Fe(CN)_6] \rightleftharpoons 4K^{+} + [Fe(CN)_6]^{4-}, giving n = 5 ions per formula unit. For partial dissociation, . With , ,

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Question ID VK-098620