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1991
If the value of ∆H for a reaction is negative, it means that the reaction is
  • A. slow
  • B. exothermic
  • C. spontaneous
  • D. irreversible
  • E. not feasible
View Answer & Discuss WAEC 1997
1992
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 (5) WAEC 1997
1993
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
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1994

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 (3) WAEC 1997
1995
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
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