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116
In which of the following are the substances arranged in their correct order of increasing melting point?
  • A. Sodium chloride, sulphur, diamond
  • B. Diamond, sodium chloride, sulphur
  • C. Sulphur, sodium chloride, diamond
  • D. Diamond, sulphur, sodium chloride
  • E. Sulphur, diamond, sodium chloride
View Answer & Discuss WAEC 1991
117
A compound which liberates carbon (IV) oxide from a hydrogentrioxocarbonate (lV) could have the molecular formula
  • A. C2H5OH
  • B. C 3H 4
  • C. HCOOH
  • D. H2O2
  • E. C6H6
View Answer & Discuss (2) WAEC 1991
118
CH4(g) + 2O2(g) → 2H2O(l) + CO2(g) ∆H = 890KJ mo-1 ∆H in the reaction represented by the equation above is the enthalpy of
  • A. formation
  • B. combustion
  • C. solution
  • D. activation
  • E. neutralization
View Answer & Discuss (3) WAEC 1991
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119

Consider the reaction represented by the equation below: H2(g) + 12(s) ⇌ 2HI(g) ∆H negative. Which of the following takes place when the temperature of the reaction vessel is decreased?

  • A. the gases condense
  • B. the yield of hydrogen increases
  • C. the concentration of the reactants remain constant
  • D. more of the hydrogen iodide decomposes
  • E. the yield of hydrogen iodide increases
View Answer & Discuss (3) WAEC 1991
120

2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3 = 85, molar volume of gases at s.t.p. = 22.4dm3)

  • A. 1.12dm3
  • B. 2.24dm3
  • C. 4.48dm3
  • D. 11.2dm3
  • E. 22.4dm3
View Answer & Discuss (12) WAEC 1991
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