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Chemistry 1991 WAEC Past Questions

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16
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
17

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
18

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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19
Esterification of propane 1,2,3-triol and unsaturated higher carboxylic acids will produce
  • A. fats
  • B. soap
  • C. methly-propanoate
  • D. alkanols
  • E. oils
View Answer & Discuss (17) WAEC 1991
20
The ratio of reactants to products is 1: 3: 2 in the reaction represented by the equation below: N2,/SUB> (g) → 2NH3(g) which of the following law is demonstrated by this?
  • A. Boyle's law
  • B. Law of multiple proportion
  • C. Gay Lussac's law
  • D. Law of constant composition
  • E. Avogadro's law
View Answer & Discuss (1) WAEC 1991
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