Which of the following cations will have minimum flocculation value for arsenic sulphide sol?

Options

A. `Na^(+)`
B. `Mg^(2+)`
C. `Ca^(2+)`
D. `Al^(3+)`

Answer

D

Explanation

According to Hardy Schulze rule, higher the coagulation power of an iron, smaller the flocculating value.
`Al^(3+) gt Mg^(2+), Ca^(2+) gt Na^(+)`