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IGCSE O Level Chemistry Competitive Exam MCQs – Mock Test 123

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Download the "Atoms & Elements Notes" App (iOS & Android): Main elements of living things do not include; MCQ with answers: phosphorus, nitrogen, calcium, and sodium. Study Elements, Compounds and Mixtures Questions and Answers, Apple Book to download free chapter to improve chemistry online delivery.

Atoms & Elements MCQs – Mock Test 123 PDF Download

MCQ 611: Main elements of living things do not include:

  1. nitrogen
  2. Phosphorus
  3. Sodium
  4. Calcium

MCQ 612: The number of electrons in calcium is 20. outermost shall have as many as:

  1. no electrons
  2. 1 electron
  3. 2 electrons
  4. more than 2 electrons

MCQ 613: Which statement is correct about amphoteric oxides?

  1. they are only acidic oxides only
  2. they are only basic oxides only
  3. they are neutral oxides
  4. they are both acidic and basic oxides

MCQ 614: Selective charges occur for the:

  1. ions which require least energy to be discharged
  2. ions which require most energy to be discharged
  3. elements of group VII
  4. metal chlorides

MCQ 615: Sulfite ion can be written symbolically as:

  1. SO4−2
  2. SO3−2
  3. SO4−3
  4. S−2

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