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What is the charge on the colloidal part...

What is the charge on the colloidal particles in the following ?
a. `Fe(OH)_(3)` sol
b. `As_(2)S_(3)` sol
c. Colloidal sol of sillver

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(i) `Fe(OH)_3` sol : +ve
(ii) `As_2S_3` sol : -ve (iii) Colloidal sol of silver : -ve
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