Match List I (Waste water treatment process) with List II (Explanation).
List I
i.Ozonation
ii.Aeration
iii.Flocullation
iv.Screening
List II
a.Removal of excess ion and manganese
b.Removal of large solids
c.Disinfection
d.Very small particles are clustered together
Ai-c, ii-a, iii-d, iv-b ✓ Correct
Bi-c, ii-a, iii-b, iv-d
Ci-a, ii-c, iii-b, iv-d
Di-d, ii-b, iii-c, iv-a
Correct answer: (A) i-c, ii-a, iii-d, iv-b
Explanation
Correct matching links ozonation with disinfection, aeration with removing iron and manganese, flocculation with clumping tiny particles, and screening with removing large solids.
Ozonation uses ozone to disinfect water by killing microbes.
Aeration adds air that oxidises and removes dissolved iron and manganese.
Flocculation gathers very small particles into larger clusters that settle.
Screening traps large floating solids at the start of treatment.
Removing grit and large solids early protects later treatment equipment.
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