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

Options

A. `Na ^(+) gt Al ^(3+) gt Ba ^(2+)`
B. `PO _(4) ""^(3-) gt SO _(4)^(2-) gt Cl ^(-)`
C. `Cl ^(-) gt SO _(4) ^(2-) gt PO _(4) ^(3-)`
D. `Al ^(3+) gt Ba ^(2+) gt Na ^(+)`

Answer

D

Explanation

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