(d) State your observations when a beam of visible light is directed on a
beaker containing milk which was left undisturbed for a long time.
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Answer:
(i) When a beam of light is passed through a colloidal sol, colloidal particles scatter light and we can see the path of light. Thus, Tyndall effect is observed.
(ii) When an electrolyte, NaCl is added to hydrated ferric oxide sol.
NaCl provides colloidal particles which coagulate oppositely charged ferric hydroxide colloidal particles bearing positive charge.
(iii) When electric current is passed through a colloidal sol, the colloidal particles move towards oppositely charged electrode, where they lose their charge and are coagulated. The process is known as electrophoresis.
Answer:
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Explanation:
Ans: The colloidal solution, i.e. Milk, scatter the beam of light and we are able to see the path of light.
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