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Class 7 Science MCQs (Grade 7) From Textbook

Class 7 Science MCQs – Certification Test 308

Water Treatment Quiz (Question 308) – App & e-Book Download

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MCQ 308: An addition of small dose of chlorine gas to the filtered water is known as:

  1. coagulation
  2. sedimentation
  3. filtration
  4. chlorination
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