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1

The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is?

  • A. yellow to purple
  • B. orange to green
  • C. green to orange
  • D. purple to yellow
View Answer & Discuss JAMB 2009
2

Hydrogen sulphide gas can act as?

  • A. an oxidizing agent
  • B. a dehydrating agent
  • C. a bleaching agent
  • D. a precipitating agent
View Answer & Discuss (8) JAMB 2009
3

The acid that is used to remove rust is?

  • A. boric
  • B. hydrochloric
  • C. trioxonitrate (V)
  • D. tetraoxosulphate (VI)
View Answer & Discuss (9) JAMB 2010
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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4

When chlorine gas is passed into a solution of sulphur dioxide?

  • A. sulphur dioxide is reduced to sulphur
  • B. the chlorine is oxidized to hydrochloric acid
  • C. dilute sulphuric acid and hydrochloric acid are produced
  • D. Hydrochloric acid and sulphur are produced
  • E. sulphur trioxide is the only product
View Answer & Discuss (3) JAMB 1980
5

In the diagram above, the purpose of the asbestos to?

  • A. absorb impurities
  • B. catalyze the reaction
  • C. solidify the gas
  • D. dry the gas
View Answer & Discuss JAMB 2010
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208