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Chemistry Past Questions

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2066

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
2067
An exothermic reaction is one which involves
  • A. attainment of dynamic equilibrium
  • B. loss of heat to the surrounding
  • C. evolution of gas as it proceeds
  • D. positive change in value of enthalpy
View Answer & Discuss WAEC 1999
2068
Which of the following is an acid salt?
  • A. NH4CI
  • B. MgSO4 7H2O
  • C. CH3COONa
  • D. NaHCO3
View Answer & Discuss (5) WAEC 1999
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2069
Which of the following compounds dissolves in water to form a solution with pH below 7?
  • A. Sodium tetraoxosulphate (VI)
  • B. Potassium hydroxide
  • C. Ammonium chloride
  • D. Sodium trioxocarbonate (IV)
View Answer & Discuss WAEC 1999
2070
If the solubility of KHCO3 is 0.40 mole dm-3 at room temperature , calculate the mass of KHCO3 in 100dm3 of the solution at this temperature. [KHCO3 = 100hmol]
  • A. 4.0g
  • B. 10.0g
  • C. 40.0g
  • D. 100.0g
View Answer & Discuss (7) WAEC 1999
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