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Chemistry WAEC Past Questions

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1951

Consider the reaction represented by the equation:

   C\(_3\)H\(_8\)  +  5 O\(_2\)  → 3CO\(_2\)  +  4H\(_2\)O

If 0.1 mole of  C\(_3\)H\(_8\) was completely burnt, what volume of CO\(_2\) would be produced at stp? [volume of gas at stp = 22.4dm\(^3\)mol\(^{-1}\)].

  • A. 6.72dm\(^3\)
  • B. 2.24dm\(^3\)
  • C. 0.30 dm\(^3\)
  • D. 0.10dm\(^3\)
View Answer & Discuss (4) WAEC 2024
1952

Naturally occurring Boron is made up of 19.9% \(^{10}\)B and 80.1% \(^{11}\)B. The relative atomic mass of Boron is

  • A. 21.0
  • B. 10.8
  • C. 10.5
  • D. 10.0
View Answer & Discuss (1) WAEC 2024
1953

The number of shared pair of electrons in a molecule of methane is 

  • A. 2
  • B. 4
  • C. 6
  • D. 8
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1954

Isotopes of the same element have similar chemical properties because they have the same number of

  • A. nuclides
  • B. protons
  • C. neutrons
  • D. atoms
View Answer & Discuss (2) WAEC 2024
1955

Which of the following household liquids would be effective in treating someone with too much acid in the stomach?

  • A. Strong salt solution with pH 7.0
  • B. Tomato juice with pH 4.1
  • C. Milk of Magnesia with pH 10.5
  • D. Black coffee with pH 5.0
View Answer & Discuss WAEC 2024
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