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MHT CET202526 Apr 2025Evening ShiftChemistrySolutionsActual

Which of the following aqueous solutions having same molality exhibits maximum boiling point elevation? (Assume complete dissociation)

Options

  1. AKCl
  2. BNaCl
  3. CAlCl₃
  4. DBaCl₂

Correct answer

C. AlCl₃

Step-by-step solution

Boiling point elevation is a colligative property given by the formula T_b = i K_b m , where K_b and m are constant for all aqueous solutions. The elevation is therefore proportional to the van't Hoff factor i . For each solute: KCl dissociates as KCl K ^+ + Cl ^- , giving i = 2 . NaCl dissociates as NaCl Na ^+ + Cl ^- , giving i = 2 . AlCl₃ dissociates as AlCl₃ Al ³⁺ + 3 Cl ^- , giving i = 4 . BaCl₂ dissociates as BaCl₂ Ba ²⁺ + 2 Cl ^- , giving i = 3 . The highest van't Hoff factor is i = 4 for AlCl₃, which theref

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