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Chemistry 2011 WAEC Past Questions

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16
Which of the following statements about displacement reaction is correct?
  • A. A more electropositive element displaces a less electroposive one
  • B. A less electropositive element displaces a more electropositive one
  • C. The position of elements in the reactivity series has no effect on the reaction
  • D. it only occurs when the reaction is at equilibrium
View Answer & Discuss WAEC 2011
17
The volume occupied by 17g of H2S at s.t.p. is [H = 1.00, S = 32.0, Molar volume = 22.4 dm3]
  • A. 11.2dm 3
  • B. 17.0 dm3
  • C. 34.0dm 3
  • D. 44.8dm 3
View Answer & Discuss (6) WAEC 2011
18
Consider the reaction represented by the following equation: xKMnO 4(aq) + ySO2(g) + zH2O(I) → K 2SO4(AQ) + 2MnSO4(aq) + 2H2SO x,y and z are respectively
  • A. 2,5 and 2
  • B. 2,2 and 5
  • C. 5, 1 and 2
  • D. 1, 5 and 2
View Answer & Discuss (8) WAEC 2011
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19
What is the amount of magnesium that would contain 1.20 x 1024 particles? [Mg = 24, Avogadro's constant = 6.02 x 1023]
  • A. 0.5 moles
  • B. 2.0 moles
  • C. 12.0 moles
  • D. 24.0 moles
View Answer & Discuss (7) WAEC 2011
20
The number of atoms in one mole of a substance is equal to the
  • A. mass number
  • B. oxidation number
  • C. atomic number
  • D. avogadro number
View Answer & Discuss WAEC 2011
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