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Chemistry WAEC Past Questions

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46
If 200cm 3 of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm3)
  • A. 300g
  • B. 200g
  • C. 150g
  • D. 30g
  • E. 15g
View Answer & Discuss (6) WAEC 1989
47
How many carbon atoms are there in a benzene ring?
  • A. 4
  • B. 5
  • C. 6
  • D. 7
  • E. 8
View Answer & Discuss (2) WAEC 1989
48
Which of the following gases will bleach moist litmus paper?
  • A. CI2
  • B. CO2
  • C. SO2
  • D. HCI2
  • E. N2 O
View Answer & Discuss (4) WAEC 1989
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49

Given that for the reaction KOH (aq) + HCI(aq) → KCI(aq) + H2O(L) H = - 54 Kj mol-1. What is the quantity of heat involved in the reaction?2NaOH(aq) + H2SO 4(aq) → Na2SO4(aq) + 2H 2O(l)?

  • A. - 108Kj
  • B. -54 kj
  • C. -27 kj
  • D. +27 kj
  • E. +54 kj
View Answer & Discuss (4) WAEC 1989
50

When an element can exist in two or more forms in the same physical state, the element is said to exhibit

  • A. isotopy
  • B. isomerism
  • C. allotropy
  • D. hygroscopy
  • E. sublimation
View Answer & Discuss (2) WAEC 1989
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