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Which one of the following is the ratio of the lowering of vapour pressure of 0.1 M aqueous solutions of BaCl ₂, NaCl and Al ₂ ( SO ₄ )₃ respectively?

Options

  1. A3 : 2 : 5
  2. B5 : 2 : 3
  3. C5 : 3 : 2
  4. D2 : 3 : 5

Correct answer

A. 3 : 2 : 5

Step-by-step solution

Lowering of vapour pressure is a colligative property. It depends on the number of particles of the solute. aligned BaCl ₂ & Ba ²⁺+2 Cl ⁻ ; 3 ions NaCl & Na ⁺+ Cl ⁻ ; 2 ions Al ₂ ( SO ₄ )₃ & 2 Al ³⁺+3 SO ₄³⁻ ; 5 ions aligned Hence the ratio of lowering of vapour pressure is 3: 2: 5 .

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