1.

Which of the following has highest coagurating power for As _(2)S_(3) sol ?

Answer»

`SO _(4) ^(2-)`
`AL ^(3+)`
`PO_(4) ^(3-)`
`K^(+).`

Solution :`As _(2) S _(3)`is a NEGATIVELY charged sol so the flocculation of this sol will depend upon the high CHARGE of cations, So, highest coagulating POWER will be of `AL ^(3+)` ions.


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