Correct Answer: Option A

Explanation

The most common chemical used for coagulation in water purification is aluminum tetraoxosulphate(VI), also known as alum.

CuSO\(_4\) is used as a fungicide, algaecide, herbicide, root killer, and soil additive. It can also be used to protect plants during seed treatment.

Na\(_2\)SO\(_4\) is used to dry organic liquids. As a filler in powdered home laundry detergents. 

CaSO\(_4\) is used in tofu(a food prepared by coagulating soy milk and then pressing the resulting curds into solid white blocks of varying softness) as a coagulant. 

There is an explanation video available below.

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