1.

Amongthe electrolytes Na_(2)SO_(4),CaCl_(2),Al_(2)(SO_(4))_(3) and NH_(4)Cl, the most effective 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 :`Sbg_(2)S_(3)` is a negatively charged SOL. The most effective coagulating agent will be electrolyte with HIGHEST positive cfharge on the cartion, vz, `AL_(2)(SO_(4))_(3).` The order is
`Al^(3+)gt Ca^(2+)gt Na^(+)gt NH_(4)^(+).`


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