Class 10 Chemistry e-Book's MCQs - Complete
Water Pollution MCQ App Download & e-Book - 47
Apps:
MCQ:
Step of sewage water treatment in which sewage is placed in tanks and aerated with large blowers is called
- primary sewage treatment
- secondary sewage treatment
- activated sludge treatment
- chlorination
c
Class 10 Chemistry App & e-Book Tests PDF Download
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10th Grade Chemistry MCQs eBook Download
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