In order to coagulate the impurities present in water. Which is the most effective ion present in the ‘alum’-

Options

A. `K^(+)`
B. `SO_(4)^(2-)`
C. `Al^(3+)`
D. None of these

Answer

C

Explanation

The impurities carry negative charge hence `Al^(3+)` will exhibit maximum coagulating power.