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Chemistry 1992 WAEC Past Questions

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26
Vulcanization of rubber
  • A. stops the growth of fungus on the rubber
  • B. increases the solubility of the rubber
  • C. decreases the elasticity of the rubber
  • D. hardnes the rubber through cross-linkage
  • E. removes sulphur from the rubber
View Answer & Discuss WAEC 1992
27
If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?
  • A. the reaction vessel gets hotter as the reaction proceeds
  • B. ∆H for the reaction is positive
  • C. the rate of the reaction increases with time
  • D. the activation energy of the reaction is high
  • E. the rate of the reaction increases with time
View Answer & Discuss WAEC 1992
28
If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?
  • A. the reaction vessel gets hotter as the reaction proceeds
  • B. ∆H for the reaction is positive
  • C. the rate of the reaction increases with time
  • D. the activation energy of the reaction is high
  • E. the rate of the reaction increases with time
View Answer & Discuss (1) WAEC 1992
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29

Which of the following statement is not correct about esterification?

  • A. It is a slow reaction
  • B. the process is reversible
  • C. it is similar to hydrolysis
  • D. it is catalysed by acids
  • E. the products usually have a fruity smell
View Answer & Discuss (8) WAEC 1992
30
Which of the following statements is not correct? The 4s orbital
  • A. is defined by the quantum number 1 = O
  • B. is of higher energy than the 3d orbital
  • C. contains a maximum of two electrons
  • D. is spherical about the nucleus
  • E. is filled before the 4p orbital
View Answer & Discuss (2) WAEC 1992
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