1.

The coagulating power of an electrolyte for arsenious sulphide sol decreases in the order:

Answer»

`Na ^(+) GT Al ^(3+) gt Ba ^(2+)`
`PO _(4) ""^(3-) gt SO _(4)^(2-) gt Cl ^(-)`
`Cl ^(-) gt SO _(4) ^(2-) gt PO _(4) ^(3-)`
`Al ^(3+) gt Ba ^(2+) gt Na ^(+)`

Solution :`As _(2) S _(3)` is a negative sol and therefore coagulating power DECREASES as `Al ^(3+) gt Ba ^(2+) gt Na ^(+)`


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