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Chemistry 2008 WAEC Past Questions

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16
Consider the reaction represented by the following equation: Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g) what volume of hydrogen gas is produced at s.t.p. when 3.25 g of zinc reacts with excess dilute HCI? [Zn = 65, Molar gas volume at s.t.p. = 22.4 dm-3]
  • A. 1.12 dm3
  • B. 2.24dm3
  • C. 4.48dm3
  • D. 8.96dm3
View Answer & Discuss (3) WAEC 2008
17
Which of the following gases has the lowerst rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, CI = 35]
  • A. Chlorine
  • B. Hydrogen
  • C. Neon
  • D. Oxygen
View Answer & Discuss (3) WAEC 2008
18
In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the
  • A. number of the collisions between the gas molecules and the walls of the container
  • B. kinetic energy of the gas
  • C. number of collisions between the gas molecules
  • D. number of repulsion between the gas molecules
View Answer & Discuss (4) WAEC 2008
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19

When concentrated \(H_2SO_4\) is added to NaCI (s), the gas evolved

  • A. bleaches damp blue litmus paper
  • B. forms a white preciptate with AgNO3(aq)
  • C. forms a white precipitate with BaCI2(aq)
  • D. turns moist red litmus paper blue
View Answer & Discuss (11) WAEC 2008
20
The collision theory proposes that
  • A. reactants collide more frequently to bring about reduction in the reaction rate
  • B. all collisions of reactants are effective
  • C. reactants must collide with a certain minimum amount of energy to from products
  • D. the fewer the collisions the faster the reaction rate
View Answer & Discuss WAEC 2008
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