The coagulation power of an electrolyte for `As_(2) S_(3)` decreases in the order:

Options

A. `NaCl lt BaCl_2 lt AlCl_3`
B. `BaCl_2 lt AlCl_3 lt NaCl`
C. `AlCl_3 lt NaCl ltBaCl_2`
D. `AlCl_3 lt BaCl_2 lt NaCl`

Explanation

The coagulating power of an electrolyte depends upon the charge on the oppositely charged ion of the electrolyte. For negatively charge sol, the order is :
`Na^(+) lt Ba^(2+) lt Al^(3+)`