1.

Among the electrolytes Na _(2) SO_(4), CaCl_(2), Al_(2) (SO_(4)) _(3) and NH_(4)Cl, the most efective coagulating agent for Sb _(2) S_(3) sol is

Answer»

`Na _(2) SO_(4)`
`CaCl_(2)`
`Al _(2) (SO_(4)) _(3)`
`NH_(4)Cl`

Solution :`Sb _(2) S_(3)` is a NEGATIVELY charged sol. Hence `Al_(2) (SO_(4)) _(3)` is the most effective coagulating agent because higher the magnitude of OPPOSITE charge `(Al ^(3+)),` higher is the coagulating power.


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