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GK QUESTION#3393

Which of the following statements best describes the Hardy Schulze rule?

  1. AThe amount of electrolyte required for the coagulation of a definite amount of a colloidal solution is dependent on the valency of the coagulating ion.Correct answer
  2. BThis is applied to obtain a colloidal solution of metals such as gold, silver or platinum.
  3. CThe ions are removed from the solution by the phenomenon of diffusion through a permeable membrane.
  4. DThe partial pressure of a component in a liquid mixture is proportional to its mole fraction in that mixture.
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Answer

A. The amount of electrolyte required for the coagulation of a definite amount of a colloidal solution is dependent on the valency of the coagulating ion.

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Explanation

For comparable lyophobic sols, the Hardy–Schulze rule relates coagulating power to the valency of the counterion, whose charge is opposite to the colloidal particles. Greater counterion valency generally gives greater coagulating power and a lower required electrolyte concentration. For a negatively charged sol, Al³⁺ is generally more effective than Ba²⁺, which is more effective than Na⁺.

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