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Chemistry 1996 WAEC Past Questions

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26
The component of air that can be removed by alkaline pyrogallol solution is
  • A. oxygen
  • B. nitrogen
  • C. water vapour
  • D. carbon (IV) oxide
  • E. noble gases
View Answer & Discuss (4) WAEC 1996
27
During water treatment for town supply, water is passed through layers of send beds in order to
  • A. soften the water
  • B. filter the water
  • C. decolorize the water
  • D. destroy the germs in the water
  • E. coagulate colloidal particles in the water
View Answer & Discuss (2) WAEC 1996
28
The cleansing action of soap in hard water is not satisfactory because soap
  • A. forms insoluble calcium and magnesium salts
  • B. is made from fats and oils
  • C. has an organic component
  • D. alters the surface tension of water
  • E. is a sodium salt of higher carboxylic acids
View Answer & Discuss WAEC 1996
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29
What is the role of MnO2 in the reaction represented by the following equation?MnO2 + 4HCI2 + CI2 + 2H2O
  • A. Bleaching agent
  • B. Oxidizing agent
  • C. Amphoteric oxide
  • D. Basic oxide
  • E. Catalyst
View Answer & Discuss WAEC 1996
30
Nitrogen is prepared on a large scale by the
  • A. fractional distillation of liquefied air
  • B. decomposition of ammonium dioxonitrate (lll)
  • C. electrolysis of brine
  • D. Haber process
  • E. Contact process
View Answer & Discuss WAEC 1996
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