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Chemistry 2021 WAEC Past Questions

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Consider the following diagram and use it to answer the question below

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26

Which of the following half reaction equations represent the reaction at the cathode

  • A. A\(^{3+_{(aq)}}\)+3e\(^{-}\) \(\rightarrow\) A\(_{(s)}\)
  • B. B\(^{2+_{(aq)}}\)+2e\(^{-}\) \(\rightarrow\) B\(_{(s)}\)
  • C. A\(_{(s)}\) \(\rightarrow\) \(^{3+_{(aq)}}\)+3e\(^{-}\)
  • D. B\(_{(s)}\) \(\rightarrow\) B\(^{2+_{(aq)}}\) + 2e\(^{-}\)
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27

The reactivity of fluorine is high because of 

  • A. its high electronegativity
  • B. the small size of the fluorine atom
  • C. the availability of d-orbitals
  • D. the strong F-F bond
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28

How many coulombs of electricity would liberate 1.08g of Ag from a solution of silver salt?

[Ag = 108.0; 1F = 96500 C]

  • A. 96500 C
  • B. 9650 C
  • C. 965 C
  • D. 9.65 C
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29

The Bohr model of the atom proposed the existence of? 

  • A. the nucleus
  • B. electron shells
  • C. nucleons
  • D. neutrons
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30

The 25°C evaporation of a 100 cm\(^{3}\) solution of K\(_{2}\)CO\(_{3}\) to dryness gave 14g of the salt. What is the solubility of K\(_{2}\)CO\(_{3}\) at 25°C? [K\(_{2}\)CO\(_{3}\) = 138]

  • A. 0.01 mol dm\(^{-3}\)
  • B. 0.101 mol dm\(^{-3}\)
  • C. 1.01 mol dm \(^{-3}\)
  • D. 10.0 mol dm\(^{-3}\)
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