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Chemistry Past Questions

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
1716
The rate of the hydrogen in the reaction Zn(s) + 2HCI (aq) → ZnCI 2(g) + H 2(aq) + H 2(g) can be increased by
  • A. using Zinc powder instead of Zinc granules
  • B. using dilute instead of concentrated hydrochloric acid
  • C. cooling the container in which the mixture is placed
  • D. using an alloy of zinc instead of pure zinc
  • E. using hydrogen chloride gas instead of hydrochloric acid solution
View Answer & Discuss (4) WAEC 1989
1717
Octane number is highest in petrol containing a high proportion of
  • A. heptane
  • B. octane
  • C. 2-methylpentane
  • D. 2, 4-dimethylpentane
  • E. 2,2,4-trimethylpentane
View Answer & Discuss (2) WAEC 1989
1718
Given the following half-cell reaction; 2Cl(aq) → CI2(g) + 2e, how many mole of electrons will be required to produce 1.12dm3 of chlorine gas at s.t.p? (Molar volume of a gas at s.t.p. = 22.4dm 3)
  • A. 1.00
  • B. 0.40
  • C. 0.20
  • D. 0.10
  • E. 0.01
View Answer & Discuss (5) WAEC 1989
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1719
Which of the following is used extensively in manufacturing photographic chemicals?
  • A. Aluminium chloride
  • B. Zinc chloride
  • C. Silver chloride
  • D. Mercury (ll) chloride
  • E. lron (ll) chloride
View Answer & Discuss WAEC 1989
1720
Given that 1 mole of carbon -12 weighs 12.0g, how many atoms are there in 24.0g magnesium? (C = 12, Mg = 24, NA = 6.02 x 10 23mol-1)
  • A. 1/2 x 6.02 x 10 23
  • B. 1 x 6.02 x10 23
  • C. 2 x 6.02 x 10 23
  • D. 3x 6.02 x 10 23
  • E. 4x 6.02 x 10 23
View Answer & Discuss (2) WAEC 1989
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