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Chemistry 2012 WAEC Past Questions

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41
Which of the following pollutants is not usually recycled?
  • A. Aluminium cans
  • B. Glass bottles
  • C. Nuclear wastes
  • D. Paper wastes
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42
A metal that is widely used in the manufacture of paints and overhead electric cables is
  • A. aluminium
  • B. copper
  • C. iron
  • D. lead
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43
Brass is a mixture of
  • A. Cu and Sn
  • B. Cu and Zn
  • C. Cu and Mg
  • D. Cu and Pb
View Answer & Discuss (4) WAEC 2012
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44

Which of the following substances is mainly responsible for the depletion of the ozone layer?

  • A. Oxgyen
  • B. Chlorofluorocarbon
  • C. Carbon (ll) oxide
  • D. Nitrogen (ll) oxide
View Answer & Discuss (5) WAEC 2012
45

(a) (i) What is the structure of the atom as proposed by Rutherford?

(ii) Distinguish between the atomic number and the mass number of an element.

(iii) Explain briefly why the relative atomic mass of chlorine is not a whole number.

 

(b) (i) What is meant by first ionization energy?

(ii) List three properties of electrovalent compounds.

(iii) Consider the following pairs of elements: I. \(_9\)F and \(_{17}\)Cl; \(_{12}\)Mg and \(_{20}\)Ca. Explain briefly why the elements in each pair have similar chemical properties.

 

(c) Explain briefly the following terms using an appropriate example in each case.

(i) homologous series; (ii) heterolytic fission.

 

(d) State the indicator(s) which could be used to determine the end-point of the following titrations:

(i) dilute hydrochloric acid against sodium hydroxide solution;

(ii) dilute hydrochloric acid against ammonium hydroxide solution;

(iii) ethanoic acid against sodium hydroxide solution.

 

(e) A solid chloride E which sublimed on heating reacted with an alkali F to give a choking gas G. G turned moist red litmus paper blue. identify E, F and G.

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts