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At 27° C, 0.1 M, 1 L K₄[Fe(CN)₆] aqueous solution and 0.1 M, 1 L FeCl₃ aqueous solution are placed in a container separated by a semi permeable membrane AB. Assume complete dissociation of both the solutes. Which of the following statement is correct?

Options

  1. ABlue color is formed on both sides.
  2. BIonic solutes in aqueous solution can pass through semi-permeable membrane.
  3. CSolution on side ' y ' is hypotonic.
  4. DTo cause the reverse flow of solvent during osmosis, external pressure (any value) should be applied to side '

Correct answer

C. Solution on side ' y ' is hypotonic.

Step-by-step solution

For complete dissociation, the van 't Hoff factor i is equal to the number of ions produced per formula unit. For side 'x' containing K₄[Fe(CN)₆] : K₄[Fe(CN)₆] 4K^+ + [Fe(CN)₆]⁴⁻ Number of ions, i_x = 5 Effective concentration (osmolarity) = i_x C = 5 0.1 = 0.5 M For side 'y' containing FeCl₃ : FeCl₃ Fe³⁺ + 3Cl^- Number of ions, i_y = 4 Effective concentration (osmolarity) = i_y C = 4 0.1 = 0.4 M Since the effective concentration of side 'y' ( 0.4 M) is less than that of side 'x' ( 0.5 M), the solution on side 'y'

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