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Chemistry 2018 WAEC Past Questions

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21

The number of Hydrogen ions in 1.0\(dm^{3}\) of 0.02\(moldm^{-3}\) tetraoxosulphate(VI) acid is   \([N_{A} = 6.02 \times 10^{23}]\)

  • A. \(1.2 \times 10^{22}\)
  • B. \(1.2 \times 10^{23}\)
  • C. \(2.4 \times 10^{22}\)
  • D. \(2.4 \times 10^{23}\)
View Answer & Discuss (6) WAEC 2018
22

The most suitable substance for putting out petrol fire is

  • A. water
  • B. carbon(IV) oxide
  • C. fire blanket
  • D. sand
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23

The following factors would contribute to environmental pollution except

  • A. production of ammonia
  • B. manufacture of cement
  • C. photosynthesis
  • D. combustion
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WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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24

The position of equilibrium in a reversible reaction is affected by

  • A. particle size of the reactants
  • B. vigorous stirring of the reaction mixture
  • C. presence of a catalyst
  • D. change in concentration of the reactants
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25

The diagram above illustrates a conical flask containing water and ice. Which of the following is correct about the diagram?

  • A. The water is at lower temperature than the ice
  • B. Energy is absorbed when the ice changes to water
  • C. Energy is released when the ice changes to water
  • D. The water molecules vibrate about a fixed point
View Answer & Discuss (1) WAEC 2018
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WAEC offline past questions - with all answers and explanations in one app - Download for free
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts