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Explain what is observed when : (i) a ...

Explain what is observed when :
(i) a beam of light is passed through colloidal sol
(ii) an electrolyte NaCa is added to ferric hydroxide sol
(iii) electric current is passed through a colloidal sol ?

Text Solution

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(i) The path of light as well as the colloidal particles become visible because of Tyndall effect. For details, consult. Section 20.
(ii) The positively charged sol particles of ferric hydroxide get their charge neutralised by interacting with negative chloride ions `(Cl^(-)).` As a result, they get coagulated.
(iii) The colloidal particles move towards the oppositely charged electrode and this phenomenon is called electrophoresis.
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