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Chemistry Past Questions

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2061
Which of the following movements can be described as random motion?
  • A. wheelbarrow being pushed
  • B. car travelling on a straight line
  • C. Gas molecules colliding in a flask
  • D. Planets going round the sun
View Answer & Discuss WAEC 1999
2062
Equal volumes of CO2 cnd CO at s.t.p have the same
  • A. mass
  • B. density
  • C. rate of diffusion
  • D. number of molecules
View Answer & Discuss (1) WAEC 1999
2063
Gas molecules are said to be perfectly elastic because
  • A. they collide without loss of energy
  • B. they move about in straight lines
  • C. the distances between them are negligible
  • D. the volume occupied by them is negligible
View Answer & Discuss (1) WAEC 1999
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2064
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]
  • A. 0.040dm 3
  • B. 0.896dm 3
  • C. 5.82dm 3
  • D. 8.62dm 3
View Answer & Discuss WAEC 1999
2065

Helium is preferred to hydrogen in filling balloons because hydrogen

  • A. is inflammable
  • B. is diatomic
  • C. exhibits isotopy
  • D. is a component of water
View Answer & Discuss (2) WAEC 1999
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