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Free "Valency & Chemical Formula" App Download with MCQ: In magnesium oxide, magnesium ion requires only one oxygen ion because of the; with answers: valency of oxygen is −2, valency of oxygen is −1, and valency of magnesium is +1 for chemistry online educational participation. Learn Chemical Formulae and Equations Questions and Answers, Apple iBook to download free chapter to gain chemistry confidence.

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MCQ 401: In magnesium oxide, magnesium ion requires only one oxygen ion because of the:

  1. valency of oxygen is −1
  2. valency of Oxygen is −2
  3. valency of magnesium is +1
  4. none of above

MCQ 402: A range of boiling point indicates, that:

  1. chromatography is not correctly done
  2. fractional distillation has been carried out successfully
  3. it has got impurities
  4. impurity is absent

MCQ 403: Chemical properties of an element are largely derived through the:

  1. position in the periodic table
  2. proton number of an element
  3. nucleon number of element
  4. number of valence electrons

MCQ 404: 1 dm3 is equal to:

  1. 1 Liter only
  2. 1000 cm3 only
  3. 1 m3
  4. 1 Liter and 1000 cm3

MCQ 405: Very high boiling and melting points are of:

  1. covalent compounds
  2. ionic compounds
  3. metallic compounds
  4. dative bonds

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