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Chemistry JAMB Past Questions

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506

Which of the following is a physical change?

  • A. Freezing ice cream
  • B. dissolving calcium in water
  • C. burning kerosene
  • D. Exposing white phosphorus to air
View Answer & Discuss (7) JAMB 2009
507

The percentage of water of crystallization in ZnSO\(_4\).7H\(_2\)O is?
[Zn = 65, S = 32, O = 16, H = 1]

  • A. 33%
  • B. 44%
  • C. 55%
  • D. 87%
View Answer & Discuss (15) JAMB 2009
508

0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 mole of a solution of hydrochloric acid. The volume of gas evolved at s.t.p is?
[Molar volume of a gas at s.t.p = 22.4 dm3]

  • A. 224cm3
  • B. 168cm3
  • C. 112cm3
  • D. 100cm3
View Answer & Discuss (20) JAMB 2009
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509

A gas exerts pressure on its container because?

  • A. the molecules of a gas collide with the walls of the container
  • B. some of the molecules are moving faster than others
  • C. of the collisions of the molecules with each other
  • D. of the mass of the molecules of the gas
View Answer & Discuss (7) JAMB 2009
510

The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are perfectly elastic implies that the?

  • A. forces of attraction and repulsion are in equilibrium
  • B. gaseous molecules can occupy any available space
  • C. gaseous molecules will continue their motion indefinitely
  • D. gases can be compressed
View Answer & Discuss (12) JAMB 2009
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