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Chemistry WAEC Past Questions

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36
The reaction represented by the equation C(s) + H2O(l) → CO(s) + H 2(s) was carried out at 27oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S)
  • A. - 4176 J
  • B. +4176 J
  • C. - 900 J
  • D. + 900 J
  • E. +8100 J
View Answer & Discuss (6) WAEC 1988
37
During the electrolysis of dilute tetraoxosulphate (VI) acid solution 0.05 mole of electrons were passed what volume of gas was produced at the anode? (Gaseous molar volume = 22. 4dm3 at s.t.p)
  • A. 0.224 dm3
  • B. 0.280 dm3
  • C. 0.560 dm3
  • D. 2.24 dm3
  • E. 22.4 dm3
View Answer & Discuss (9) WAEC 1988
38

The major raw material in a plastic industry is

  • A. ethanol
  • B. sulphur
  • C. methylethanoate
  • D. ethene
  • E. ethane
View Answer & Discuss (4) WAEC 1989
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39
Which of the following reactions represents the laboratory preparation of hydrogen?
  • A. C(s) + H 2 O(l) → CO(g) + H2(g)
  • B. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
  • C. Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
  • D. Cu(s) + H2O(l) → CuO(s) + H2(g)
  • E. 2AI(s) + 3H2O(l) → Al2O3(s) + 3H2(g)
View Answer & Discuss (4) WAEC 1989
40
Which of the following statements best explains cracking ? It is a process
  • A. in which an alkene adds on itself repeatedly to form long chain polymers
  • B. in which large hydrocarbon molecules are broken into smaller units
  • C. for measuring theoctane number of petrol
  • D. in which carbon chain results in a zigzag arrangement
  • E. in which aromatic hydrocarbons are produced
View Answer & Discuss (2) WAEC 1989
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