Class 10 Chemistry App (iOS & Android) – Water Pollution MCQs e-Book PDF

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Class 10 Chemistry MCQs – Certification Test 194

Water Pollution MCQs (Question 194) – App & e-Book Download

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MCQ 194: The fourth step of sewage water treatment is called:

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

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

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