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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 366:
In which of the following processes are larger molecules broken down into smaller molecules?
  • A Vulcanization of rubber
  • B Hydrogenation of palm oil
  • C Hydrolysis of starch
  • D Polymerization
  • E Esterification
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Question 367:
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
  • A CH3CH2OH
  • B (CH3)2CHCH2OH
  • C (CH3)3CCH2OH
  • D (CH3)3COH
  • E CH3CH2CH2CH2OH
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Question 368:
Which of the following is an alloy of mercury?
  • A Stainless steel
  • B Soft solder
  • C Coinage bronze
  • D Amalgam
  • E Duralumin
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Question 369:
The function of limestone in the extraction of iron in the blast furnace is
  • A Removal of the earthly impurities
  • B Decomposition of the iron ore
  • C Conversion of iron (lll) to iron (ll) compounds
  • D Generation of heat for the process
  • E Conversion of coke to carbon(ll)oxide
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Question 370:
Metals which react with steam only when they are red-hot include
  • A Copper
  • B Sodium
  • C Calcium
  • D Gold
  • E Iron
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