1.

Match the water purification stages in Group-I with the corresponding items in Group-II

A. P-3, Q-4, R-1, S-5
B. P-1, Q-4, R-3, S-2
C. P-2, Q-3, R-5, S-4
D. P-3, Q-4, R-5, S-2
Answer» E.


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