If waste water has a pH value of 6.5, it means that
Choose the correct answer
6.5 mg/litre of solids are present
It is acidic
It is alkaline
It is caustic
Correct Answer
B. It is acidic
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pH scale: 0–7 = acidic; 7 = neutral; 7–14 = alkaline/basic. pH < 7 → acidic solution. pH of wastewater affects biological treatment: optimal for aerobic bacteria is 6.5–8.5. Highly acidic or alkaline wastewater must be neutralised before discharge. IS 2490 acceptable pH for effluent discharge to inland surface water: 5.5–9.0. pH below 7 indicates acidic water
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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.