Chemistry 2017 Past Questions | WAEC

Study the following 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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