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1781

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
1782
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
1783
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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1784
In the redox reaction represented by the following equation: Cu2+aq + Zn(s) → Cu(s) + Zn2+
  • A. the oxidation number of copper increases
  • B. copper (ll) ions are reduced to copper atoms
  • C. zinc atoms are reduced to zinc ions
  • D. copper (ll) ions donate electrons to zinc atoms
View Answer & Discuss (2) WAEC 1991
1785
When starch undergoes complete enzyme-catalyzed hydrolysis, the resulting product is
  • A. glucose
  • B. maltose
  • C. sucrose
  • D. fructose
  • E. cellulose
View Answer & Discuss (2) WAEC 1991
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