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Chemistry 1997 WAEC Past Questions

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21
How much heat will be liberated if 8g of hydrogen burns in excess oxygen according to the following equation? 2H2 + O2→ 2H2O,∆H = -571.7KJ (H = 1)
  • A. 1.42.9KJ
  • B. 571.7KJ
  • C. 1143.4KJ
  • D. 285.9KJ
  • E. 2286.8KJ
View Answer & Discuss (4) WAEC 1997
22
The position of equilibrium in a reversible reaction is affected by
  • A. particle size of the reactants
  • B. change in concentration of the reactants
  • C. change in size of the reaction vessel
  • D. vigorous stirring of the reaction mixture
  • E. presence of a catalyst
View Answer & Discuss WAEC 1997
23
Separation of mixture of solids by physical methods can be based on differences in the following except
  • A. melting point
  • B. solubility
  • C. particle size
  • D. molar mass
  • E. magnetic property
View Answer & Discuss (2) WAEC 1997
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24
Ethene undergoes mainly addition reactions because it is
  • A. a gas
  • B. a hydrocarbon
  • C. unsaturated
  • D. easily polymerized
  • E. a covalent compound
View Answer & Discuss (2) WAEC 1997
25
The reaction between alkanoic acids and alkanols in the presence of a mineral acid is known as
  • A. saponification
  • B. hydrolysis
  • C. polymerization
  • D. esterification
  • E. dehydration
View Answer & Discuss WAEC 1997
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