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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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`Fe(OH)_(3)sol:+ve`
b. A `S_(2)S_(3)sol:-ve`
c. Colloidal sol of silver: `-ve`
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