According to Hardy - Schulze rule, the coagulating power of cation follows the order :

Options

A. `Ba^(+2)gt Na^(+) gt Ai^(+3)`
B. `Al^(+3)gtNa^(+)gt Ba^(+2)`
C. `Al^(+3)gtBa^(+2) gt Na^(+)`
D. `Ba^(+2) gt Al^(+3)gtNa^(+)`

Answer

C

Explanation

According to this law, the coagulating effect of an ion on dispersed phase of opposite charge increases with the increase in valency of the ion. The precipitating power of `Al^(3+),Ba^(2+)` and `Na^(+)`tions is in order `Al^(3+)gtBa^(2+)gtNa^(+)`