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MHT CET202615 April 2026Morning ShiftChemistrySolutionsActual

Which of the following solutes has the ratio of theoretical molar mass to the experimentally observed molar mass is 3 ?

Options

  1. AKCl
  2. BK ₂ SO ₄
  3. CMgSO ₄
  4. DAl ₂( SO ₄)₃

Correct answer

B. K ₂ SO ₄

Step-by-step solution

The ratio of theoretical molar mass to the experimentally observed molar mass is known as the van 't Hoff factor i . i = Theoretical molar mass Observed molar mass We need to find the solute for which i = 3 . Assuming complete dissociation for the given strong electrolytes: For KCl K ^+ + Cl ^- , i = 2 For K ₂ SO ₄ 2 K ^+ + SO ₄²⁻ , i = 3 For MgSO ₄ Mg ²⁺ + SO ₄²⁻ , i = 2 For Al ₂( SO ₄)₃ 2 Al ³⁺ + 3 SO ₄²⁻ , i = 5 Thus, K ₂ SO ₄ has a van 't Hoff factor of 3 . Answer: K ₂ SO ₄

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