Class 7 Geography Study App (iOS & Android) – Types of Pollution e-Book PDF

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Class 7 Geography MCQs – Certification Test 216

Types of Pollution Quiz (Question 216) – Study App & e-Book Download

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MCQ 216: The poisonous substances that can be present in industrial wastes does not includes:

  1. phosphates
  2. nitrates
  3. mercury and lead
  4. oxygen
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Types of Pollution Quiz App & e-Book – Class 7 Geography Placement Tests

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