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Chemistry 2018 WAEC 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
11

Ethene is produced from ethanol by

  • A. decomposition
  • B. hydrolysis
  • C. ozonolysis
  • D. dehydration
View Answer & Discuss (1) WAEC 2018
12

Consider the following equilibrium reaction: \(2AB_{{2}{(g)}} + B_{{2}{(g)}} \to 2AB_{{3}{(g)}}\). \(\Delta H= -X kJmol^{-1}\). The backward reaction will be favored by

  • A. a decrease in pressure
  • B. an increase in pressure
  • C. a decrease in temperature
  • D. an introduction of a positive catalyst
View Answer & Discuss (2) WAEC 2018
13

What is the mass of solute in 500\(cm^{3}\) of 0.005\(moldm^{-3}\) \(H_{2}SO_{4}\)? ( H = 1, S = 32.0, O=16.0)

  • A. 0.490g
  • B. 0.049g
  • C. 0.245g
  • D. 0.0245g
View Answer & Discuss (13) WAEC 2018
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14

Pure water can be made to boil at a temperature lower than 100°C by

  • A. reducing its quantity
  • B. decreasing the external pressure
  • C. distilling it
  • D. increasing the external pressure
View Answer & Discuss WAEC 2018
15

At what temperature does the solubility of \(KNO_{3}\)  equal that of \(NaNO_{3}\)?   

  • A. 0°C
  • B. 20°C
  • C. 30°C
  • D. 40°C
View Answer & Discuss WAEC 2018
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