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O Level Chemistry Competitive Exam: Certification Test 393

Chemical Symbols Notes App & e-Book: MCQ 393

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MCQ: 393

Phosphorus can have a valency of

  1. 2 or 4
  2. 4 or 6
  3. 3 or 5
  4. 2 or 1

Chemical Symbols Competitive Exam: O Level Chemistry App & eBook Notes

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