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Account for the following (i) Fe(OH)3 sol is positively charged

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Account for the following 

(i) Fe(OH)3 sol is positively charged 

(ii) The extent of physical adsorption decrease with rise in temperature.

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(i) A deep red sol of Fe(OH)3 is obtained by the hydrolysis of FeCl3.The sol particles are positively charged because of preferential adsorption of Fe3+ ions 

(ii) Adsorption is an exothermic process. So the rate of physical adsorption decreases with the rise in temperature in accordance with the Le-Chatlier principle. 

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