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Chemistry 2019 WAEC Past Questions

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46

The number of electrons in the 3d orbital of  \(_24\)Cr is

  • A. 2
  • B. 3
  • C. 4
  • D. 5
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47

The method used to collect gas in the laboratory depends on its?

I. boiling point  II. density  III. smell  IV. solubility in water

  • A. i and ii only
  • B. ii and iv only
  • C. iii and iv
  • D. i, ii, iii and iv
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48

Which of the following methods is NOT used  for the separation of mixtures?

  • A. Chromatography
  • B. Crystallization
  • C. Distillation
  • D. Electrolysis
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49

The group to which elements belong in the periodic table is determined by the number?

  • A. electrons
  • B. core electrons
  • C. valence shells
  • D. valence electrons
View Answer & Discuss (1) WAEC 2019
50

Kipps  apparatus can be used to prepare?

  • A. H\(_2\)
  • B. NH\(_3\)
  • C. O\(_2\)
  • D. H\(_2\)S
View Answer & Discuss (1) WAEC 2019
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