What is the primary purpose of using bleaching powder in drinking water?

Statement: L ≥ X ≤ Z > Y ≤ A, Y = B ≥ C 

Conclusion: I. C >A                          II. A ≥ C

Statement: M < N ≤ O = P, Q ≥ O ≤ R ≤ Z

Conclusion: I. Q > M                        II. Z > M

Statements:

A > L ≥ W = J ≤ T; Y ≥ Z > L ≥ P

Conclusions:

I).  P ≤ A

II).  T > Y

Statements: G < O = H ≥ L > F < U≤ T ≥ Z

Conclusion:

I. L ≤ O

II. T > L

Statements: C ≥ E > M ≤ Z < B; G ≥ Z > K

Statements: F % W, W © R, R @ M, M $ D

Conclusions:

Statements:

J ≥ F = P; F > S ≥ A; S ≥ B < C

Conclusions:

I. C > A

II. B < J

Statements: F ≥ G < H = I; J < I; K > L = F

Conclusions:

I. I > K

II. G < L

III. L ≥ G

In which of the following expressions will the expression ‘M ≥ N ' and ‘Q < O’ be definitely true?