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Class 7 Science MCQs (Grade 7) From Textbook

Class 7 Science MCQs – Certification Test 1270

Water Treatment MCQs (Question 1270) – Study App & e-Book Download

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MCQ 1270: The alum is a compound of two elements, those are:

  1. aluminum and nitrate
  2. aluminum and sulfate
  3. sodium and nitrate
  4. sodium and sulfate

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