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1226
In the purification of town water supply, alum is used principally to?
  • A. kill bacteria
  • B. control the pH of water
  • C. improve the taste of the water
  • D. coagulate small pasrticles of mud
View Answer & Discuss (6) JAMB 1987
1227
Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?
  • A. Permanently hard water after boiling
  • B. emporarily hard water after boiling
  • C. Rain water stored in a glass jar for two years
  • D. Permanent hard water passed through permuitit
View Answer & Discuss (8) JAMB 1987
1228
Oil spillage in ponds and creeks can be cleaned up by?
  • A. burning off the oil layer
  • B. spraying with detergent
  • C. dispersal with compressed air
  • D. spraying with hot water
View Answer & Discuss (15) JAMB 1987
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
1229

The solubility of Na3AsO4(H2O)12 is 38.9g per 100g H2O. What is the mass percentage of Na3AsO4 in the saturated solution?

(As = 75, Na = 23, O = 16, H = 1)

  • A. 87.27%
  • B. 38.9%
  • C. 19.1%
  • D. 13.7%
View Answer & Discuss (33) JAMB 1987
1230
In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?
  • A. Ethanoic acid, milk or magnesia, sodium chloride, hydrochloric acid and sodium hydroxide
  • B. Ethanoic acid, hydrochloric acid, milk of magnesia, sodium chloride and sodium chloride and sodium hydroxide
  • C. Hydrochloride acid, ethanol acid, sodium chloride, milk of magnesia and sodium hydroxide
  • D. Hydrochloride acid, sodium hydroxide sodium chloride, ethanol acid, and milk of magnesia
View Answer & Discuss (7) JAMB 1987
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