Question

The coagulating power of electrolytes having inos `Na^(o+),Al^(3+)` and `Ba^(2+)` for arsenic sulphide sol increases in the order
A. `Al^(3+) lt Ba^(2+) lt Na^(+)`
B. `Na^(+) lt Ba^(2+) lt Al^(3+)`
C. `Ba^(2+) lt Na^(+) lt Al^(3+)`
D. `Al^(3+) lt Na^(+) lt Ba^(2+)`

Answer 1

Correct Answer - B
According to Hardy Schulze rule, greater the charge on cation, greater is its coagulating power for negatively charged solution. So, order of coagulating power : `Na^(+) lt Ba^(2+) lt Al^(3+)`.