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Solids settling out in primary treatment form the primary:
AFerment
BSludge
CEffluent
DAerosol
Answer & Solution
Correct answer: B. Sludge
1. The liquid left above is called the effluent.
2. The settled material has its own name.
3. It is the primary sludge.
_Source: NCERT Class 12 Biology, Chapter 10, Microbes in Human Welfare._
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