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In a solution, mole fraction of solute is 0.2 , when lowering in vapour pressure is 10 mm Hg . To get lowering of vapour pressure of 20 mm Hg , mole fraction of solute in solution is

Options

  1. A0.2
  2. B0.4
  3. C0.6
  4. D0.8

Correct answer

B. 0.4

Step-by-step solution

Lowering in vapour pressure ( P ) mole fraction of solute ( x ) . array ll & P ₁ x ₁ = P ₂ x ₂ & 10 0.2 = 20 x ₂ & x ₂= 20 10 0.2=0.4 array Mole fraction of solute will be 0.4

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