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Chemistry 2013 JAMB Past Questions

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11
In a water body, too much sewage leads to
  • A. a decrease in the temperature of the water which cause in death of aquatic animals
  • B. an increase in the number of aquatic animals in the water
  • C. an increase in the bacterial population which reduces the level of oxygen in the water
  • D. a decrease in the bacterial population which increases the level of oxygen in the water
View Answer & Discuss JAMB 2013
12
10.0 dm3 of water was added to 2.0 mol dm-3 of 2.5dm3 solution of HCl. What is the concentration of the final solution in mol dm-3?
  • A. 0.4
  • B. 8.0
  • C. 2.0
  • D. 0.5
View Answer & Discuss (16) JAMB 2013
13
Three drops of a 1.0 mol dm-3 solution of HCl was added to 20 cm3 of a solution of pH6.4. The pH of the resulting solution will be
  • A. close to that of pure water
  • B. less than 6.4
  • C. greater than 6.4
  • D. unaltered
View Answer & Discuss (5) JAMB 2013
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14
Which of the following substances is not a salt?
  • A. Aluminium oxide
  • B. Sodium hydrogentrioxosulphate (V)
  • C. Sodium trioxocarbonate (V)
  • D. Zinc chloride
View Answer & Discuss (5) JAMB 2013
15
An insoluble salt can be prepared by
  • A. the reaction of trioxocarbonate (V) with an acid
  • B. double decomposition
  • C. the action of dilute acid on an insoluble base
  • D. the reaction of metals with an acid
View Answer & Discuss (1) JAMB 2013
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