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Surface Chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry3 Marks
Question
Explain what is observed when
  1. An electric current is passed through a sol.
  2. A beam of light is passed through a sol.
  3. An electrolyte (say NaCl) is added to ferric hydroxide sol.
✓

Answer

  1. Electrophoresis takes place when sol particles move towards opposite electrodes due to attraction.
  2. Tyndall effect will be observed due to scattering of light by colloidal particles.
  3. Coagulation takes place (due to neutralisation of charges.)

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