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Surface Chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry3 Marks
Question
  1. Differentiate between adsorbtion and absorption.
  2. Out of $MgCl_2$ and $AlCl_3,$ which one is more effective in causing coagulation of negatively charged sol and why?
  3. Out of sulphur sol and proteins, which one forms multimolecular colloids?
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Answer

  1.  
Adsorption Absorption
surface phenomena Bulk phenomena
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed adsorption The substance is uniformly distributed throughout the bulk of the solid essentially a bulk phenomenon.
  1. $AlCl_{3},$ more positive charge/Hardy-Schulze rule.
  2. Sulphur.

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