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Chemistry 1990 WAEC Past Questions

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11

How many molecules are there in 14g of nitrogen gas at s.t.p? (n = 14, Avogadro Number = 6. 0 x \(10^{23 }\)mol-1)

  • A. 1.2 x 10 23
  • B. 3.0 x 1023
  • C. 6.0 x1023
  • D. 1.2 x 1024
  • E. 30 x1023
View Answer & Discuss (13) WAEC 1990
12
Which of the following correctly explains entropy?
  • A. the natural tendency for a system to achieve a greater disorder
  • B. a balance of two driving forces between free energy and enthalpy changes
  • C. the cause of spontaneity of a reaction
  • D. a measure of the enthalpy of a reaction
  • E. a measure of the rate of attaining equilibrum in a reversible reaction
View Answer & Discuss WAEC 1990
13

The gas that is liberated when iron is heated with concentrated tetraoxosulphate (VI)acid is

  • A. H2S
  • B. \(SO_{2}\)
  • C. HCI
  • D. SO3
  • E. O2
View Answer & Discuss (3) WAEC 1990
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14
Which of the following salts in aqueous solution will have a pH greater than 7?
  • A. NaCl
  • B. ACI3
  • C. FeCI3
  • D. Na 2SO4
  • E. K 2CO3
View Answer & Discuss (5) WAEC 1990
15
The compound of copper which is used in electroplating dyeing, printing, wood preservation and as a fungicide is
  • A. copper (ll) hydroxide
  • B. copper (ll) trioxonitrate (V) pentahydrate
  • C. copper (ll) tetraoxosulphate (VI) pentahydrate
  • D. copper (ll) oxide
  • E. copper (ll) trioxocarbonate (lV)
View Answer & Discuss WAEC 1990
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