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Chemistry WAEC Past Questions

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1911

Determine the volume of 0.100 mol of HCl in \(0.250 mol dm^3\) of solution.

  • A. \(200cm^3\)
  • B. \(100cm^3\)
  • C. \(20cm^3\)
  • D. \(400cm^3\)
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1912

Positive ions in a sea of electrons are found in

  • A. covalent bonds
  • B. metallic bonds
  • C. dative bonds
  • D. ionic bonds
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1913

An element X has two isotopes, \(^{65}X_{30}\) and \(^{66}X_{30}\) with relative abundance of 60 % and 40% respectively. The relative atomic mass of X is

  • A. 66.00
  • B. 65.50
  • C. 65.00
  • D. 65.40
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1914

Which of the following statements about the collision theory is correct?

  • A. Ineffective collision brings about chemical reaction
  • B. All collisions bring about reactions
  • C. The rate of reaction is proportional to the number of effective collisions
  • D. Collision of molecules will split the molecules to react
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1915

Which of the following elements has its valence electrons in the s-orbital?

  • A. Aluminum
  • B. Phosphorus
  • C. Sodium
  • D. Carbon
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