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Chemistry WAEC Past Questions

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401
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
402
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
403
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
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404

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
405

30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g).

Calculate the total volume of the gaseous mixture at the end of the reaction

  • A. 50cm3
  • B. 35cm3
  • C. 30cm3
  • D. 25cm3
View Answer & Discuss (6) WAEC 1999
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