O Level Chemistry Study App | Chemical Symbols Quiz e-Book PDF

O Level Chemistry MCQs (O Level) From Textbook

O Level Chemistry MCQs – Certification Test 632

Chemical Symbols Quiz (Question 632) – App & e-Book Download

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MCQ 632: Valency of iron (Fe) is:

  1. Fe+2 only
  2. Fe+3 only
  3. Fe+5
  4. Fe+2 and Fe+3

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