Chemistry 2018 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.

  1. Which of the following raw materials is used in the plastic industry?

    • A. Ethene
    • B. Methane
    • C. Sulphur
    • D. Hydrogen

2.  Which of the following organic compounds can undergo both addition and substitution reactions?

  • A. Pentane
  • B. Benzene
  • C. Propane
  • D. Hexane

3.  Which of the following equations represents a redox reaction?

  • A. HNO3(aq)+NaOH(aq)NaNO3(aq)+H2O(l)HNO3(aq)+NaOH(aq)→NaNO3(aq)+H2O(l)
  • B. AgNO3(aq)+KCl(aq)AgCl(s)+KNO3(aq)AgNO3(aq)+KCl(aq)→AgCl(s)+KNO3(aq)
  • C. CaCO3(s)CaO(s)+CO2(g)CaCO3(s)→CaO(s)+CO2(g)
  • D. 2H2S(s)+SO2(g)2HO2+3S(g)

4. The process of extraction of iron from its ore is

  • A. decomposition
  • B. oxidation
  • C. reduction
  • D. sublimation

5.  What is the solubility of a salt if 0.4g of it is obtained on evaporating 200cm3cm3 of its saturated solution to dryness?

  • A. 0.08gdm3gdm−3
  • B. 2.00gdm3gdm−3
  • C. 8.00gdm3gdm−3
  • D. 80.00gdm3

6.  An acidic salt has

  • A. double anions in its aqueous solution
  • B. a single cation in its aqueous solution
  • C. hydrogen ions in its aqueous solution
  • D. hydrogen atoms in its aqueous solution

7.  Which of the following is an example of a chemical change?

  • A. Dissolution of salt in water
  • B. Rusting of iron
  • C. Melting of ice
  • D. Separating a mixture by distillation

8.  A reaction is endothermic if the

  • A. reaction vessel feels cool during the reaction
  • B. enthalpy change is negative
  • C. bond forming energy exceeds bond breaking energy
  • D. heat of formation of reactants exceeds heat of formation of products

9. In which of the following compounds does hydrogen form ionic compounds?

  • A. CH44
  • B. HCl
  • C. NH33
  • D. NaH

10. An organic compound has the empirical formula CH2CH2. If its molar mass is 42gmol1gmol−1, what is its molecular formula?  (C = 12.0, H = 1.0)

  • A. C2H4C2H4
  • B. C3H4C3H4
  • C. C3H6C3H6
  • D. C4H8

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