Multiple choice

Which of the following statements is TRUE?

  1. Sol has liquid as dispersed phase and solid as dispersion medium.

  2. For the coagulation of negatively charged arsenious sulfide sol, Al3+ ions are more effective than Ba2+ ions.

  3. Physisorption is independent of the nature of gas.

  4. Emulsions have solid as dispersed phase and liquid as dispersion medium.

  5. Peptisation is the process of converting a colloidal sol into precipitate.
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B Correct answer
Explanation

According to Hardy Schulze law greater is the valency of the coagulating or the flocculating ion, greater is its power to bring about coagulation. Hence, for the coagulation of negatively charged arsenious sulfide sol, trivalent cations (Al3+) are far more effective than divalent (Ba2+) cations.

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