Assertion A: Alum is the most commonly used coagulant in water treatment.
Reason R: Alum is very effective in killing pathogens present in the water.
Which of the following is correct?
1
Both A and R are true, but R is not a correct explanation of A.
2
A is true but R is false.
3
Both A and R are true, and R is the correct explanation of A
4
A is false but R is true.