1.

Among theelectrolytes Na_(2)SO_(4),CaCl_(2),Al_(2)(SO_(4))_(3)and NH_(4)Cl_(4), the mosteffective 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 negative sol and according to HardySchulze rule:
(i)Ions carrying charge OPPOSITE to that of sol particles are effective in causing coagulation.
(ii) Coagulating power of an electrolyte is directly proportional to the valency of the active ions.
`therefore ` Outof the given options the mosteffective coagulatingagentis `Al_(2)(SO_(4))_(3) ` or `Al^(3+)` ion.


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