Water Pollution Quiz App | Learn Class 10 Chemistry Quiz e-Book PDF
Class 10 Chemistry MCQs (Grade 10) From Textbook

Class 10 Chemistry MCQs – Certification Test 388

Water Pollution Quiz (Question 388) – App & e-Book Download

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MCQ 388: The second step of sewage water treatment is called:

  1. primary sewage treatment
  2. secondary sewage treatment
  3. activated sludge treatment
  4. chlorination

Water Pollution Quiz App & e-Book – Class 10 Chemistry Learning Guide

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