Chemistry 2017 Past Questions | WAEC

Study the following Chemistry past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

31. Potassium Chloride solid does not conduct electricity because

  • A. it is a covalent compound
  • B. strong cohesive forces make its ions immobile
  • C. strong cohesive force makes its molecule immobile
  • D. each of potassium and chlorine structures contain noble gas structure

32.  When water was added to a white anhydrous substance X, the colour changed to blue. X is

  • A. \(CuSO_{4}\)
  • B. \(FeSO_{4}\)
  • C. \(Na_{2}SO_{4}\)
  • D. \(PbSO_{4}\)

33. Solubility curve can be used in the determination of the

  • A. amount of crystals formed
  • B. amount of solvent that can be recovered
  • C. amount of solid drugs in a given solution
  • D. temperature of the solution

34.  If 0.2g of a salt is required to saturate 200\(cm^{3}\) of water at room temperature, what is the solubility of the salt?

    • A. 0.2\(gdm^{-3}\)
    • B. 1.0\(gdm^{-3}\)
    • C. 2.0\(gdm^{-3}\)
    • D. 5.0\(gdm^{-3}\)

35.  The property of a chemical reaction that is affected by the presence of a catalyst is

  • A. activation energy
  • B. free energy
  • C. equilibrium position
  • D. enthalpy change

36. Soluble salts can be prepared by the following methods except

  • A. neutralization
  • B. reaction of an acid with trioxocarbonate(IV) salt
  • C. double decomposition
  • D. reaction of an acid with electropositive metals

37. Chemical reactions occurs when the colliding reactants have energy that is

  • A. less than the activation energy
  • B. greater than the activation energy
  • C. greater than the energy of the product
  • D. less than the energy of effective collision

38. The common feature of reactions at the anode is that

  • A. electrons are consumed
  • B. ions are reduced
  • C. oxidation is involved
  • D. the electrode dissolves

39. Consider the following reaction equation: \(2NO_{(g)} + O_{{2}{(g)}} \to 2NO_{{2}{(g)}}\). What is the change in the oxidation number of nitrogen?

  • A. +2 to 0
  • B. +2 to -2
  • C. +2 to +4
  • D. +4 to +2

40. Which of the following factors characterize members of the same homologous series?

  • A. The chemical property change gradually throughout the series
  • B. physical properties of members are similar
  • C. They have the same molecular formular
  • D. Successive members undergo changes in molecular formula by CH2

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