Class 10 Chemistry e-Book's MCQs - Complete
Water Pollution App Quiz Download & e-Book - 84
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MCQ:
Step of sewage water treatment in which there are some aeration and organic material is converted to inorganic materials is called
- primary sewage treatment
- secondary sewage treatment
- activated sludge treatment
- chlorination
b
Class 10 Chemistry App & e-Book Tests PDF Download
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10th Grade Chemistry MCQs eBook Download
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