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Chemistry WAEC Past Questions

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1811

How many molecules of oxygen would occupy a volume of 2.24 cm\(^{3}\) at s.t.p?

[Molar volume at s.t.p = 22,400 cm\(^{3}\), Avogadro's number = 6.02 x 10\(^{23}\)]

  • A. 3.01 x 10\(^{20}\)
  • B. 3.01 x 10\(^{27}\)
  • C. 6.02 x 10\(^{19}\)
  • D. 6.02 x 10\(^{27}\)
View Answer & Discuss (3) WAEC 2021
1812

The isotopes of neon are represented by the symbols \(^{20}\)\(_{x}\) Ne, \(^{21}\) \(_{y}\) Ne, and \(^{22}\) \(_{z}\) Ne. The relationship between x, y, and z is?

  • A. x > y > z
  • B. x < y < z
  • C. x = y= z
  • D. x < z < y
View Answer & Discuss (4) WAEC 2021
1813

Which of the following pairs of molecules form hydrogen bonds?

  • A. C\(_{2}\)H\(_{5}\)OH and CH\(_{3}\)OH
  • B. CH\(_{3}\)OH and H\(_{2}\)
  • C. H\(_{2}\)S and CH\(_{4}\)
  • D. NH\(_{3}\) and SO\(_{2}\)
View Answer & Discuss (2) WAEC 2021
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1814

Which of the following statements about elements in Group VII is correct?

  • A. Br\(_{2}\) will oxidize CI\(^{-}\)
  • B. F\(_{2}\) has the least tendency to be reduced
  • C. Cl\(_{2}\) will oxidize I\(^{-}\)
  • D. l\(_{2}\) is a stronger oxidizing agent than F\(_{2}\)
View Answer & Discuss (9) WAEC 2021
1815

Electrovalent compounds normally ------------

  • A. have low boiling points
  • B. have mobile electrons
  • C. conduct electricity in the solid state
  • D. dissolve in polar solvent
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