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Chemistry 2018 WAEC Past Questions

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26

Which of the following statements best explains the difference between a gas and a vapour?

  • A. Unlike gases, vapours are liquids at room temperature
  • B. Unlike gases, vapour can easily be condensed into liquids
  • C. Unlike gases, vapour is readily converted into solids
  • D. Vapours are generally denser than gases
View Answer & Discuss (4) WAEC 2018
27

Consider the following reaction equation: \(2HCl + Ca(OH)_{2} \to CaCl_{2} + H_{2}O\). What is the volume of 0.1\(moldm^{-3}\) HCl that would completely neutralize 25\(cm^{3}\) of 0.3\(moldm^{-3}\) Ca(OH)\(_{2}\)?

  • A. 150\(cm^{3}\)
  • B. 75\(cm^{3}\)
  • C. 30\(cm^{3}\)
  • D. 25\(cm^{3}\)
View Answer & Discuss WAEC 2018
28

\(Cu\) and \(HNO_{3}\) are not suitable for preparing hydrogen gas because of their

  • A. reactivity and oxidation respectively
  • B. conductivity and corrosiveness respectively
  • C. melting point and reduction respectively
  • D. electronegativity and solubility respectively
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29

Which of the following CANNOT be an empirical formula?

  • A. \(CH\)
  • B. \(CH_{2}\)
  • C. \(P_{2}O_{5}\)
  • D. \(N_{2}O_{4}\)
View Answer & Discuss (3) WAEC 2018
30

One of the criteria for confirming the purity of benzene is to determine its

  • A. heat capacity
  • B. boiling point
  • C. mass
  • D. colour
View Answer & Discuss WAEC 2018
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WAEC offline past questions - with all answers and explanations in one app - Download for free
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208