If the pH value of sewage is 7
Choose the correct answer
it is acidic
it is alkaline
it is neutral
none of these
Correct Answer
C. it is neutral
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pH = 7 indicates a neutral solution (neither acidic nor basic). In sewage treatment, pH 7 means the effluent is neutral — the hydrogen ion concentration [H⁺] equals the hydroxyl ion concentration [OH⁻]. Ideal sewage pH for biological treatment is 6.5–8.5. Strongly acidic (pH < 5) or alkaline (pH > 10) conditions inhibit biological activity in sewage treatment.
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.