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Chemistry Past Questions

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1756

To what temperature must a gas be raised from 273K in order to double both its volume and pressure?``

  • A. 298k
  • B. 300k
  • C. 546k
  • D. 819k
  • E. 1092k
View Answer & Discuss (7) WAEC 1990
1757
Which of the following explains why trioxonitrate (V) acid is not used for preparing hydrogen from metals?
  • A. it is volatile
  • B. it is strongly oxidizing
  • C. it forms a layer of oxide on the metal
  • D. trioxonitrate (V) salts are soluble in water
  • E. it renders the metals passive
View Answer & Discuss (1) WAEC 1990
1758
Which of the following is normally used for drying ammonia gas?
  • A. Concentrated tetraoxonitrate (Vl) acid
  • B. Calcium oxide
  • C. anhydrous calcium chloride
  • D. phosphorus (V) oxide
  • E. anhydrous copper (ll) tetraoxosulphate (VI)
View Answer & Discuss WAEC 1990
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1759
Nuclear reactions can be used in the following except
  • A. gauging the thickness of objects
  • B. making atomic bombs
  • C. curing cancer
  • D. generating electricity
  • E. purifying water
View Answer & Discuss (1) WAEC 1990
1760
The decomposition of hydrogen peroxide is represented by the equation: 2H2O(l) + O2(g) what mass of hydrogen peroxide would be required to produce 22.4dm3 of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm3)
  • A. 18 g
  • B. 34 g
  • C. 36 g
  • D. 64 g
  • E. 68 g
View Answer & Discuss (7) WAEC 1990
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