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Chemistry 1993 WAEC Past Questions

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31
When ammonium chloride is dissolved in water in a test tube, the tube feels colder showing that
  • A. the solution is unsaturated
  • B. sublimation has ocurred
  • C. ammonia gas is evolved
  • D. the process is endothermic
  • E. condensation has occurred
View Answer & Discuss (4) WAEC 1993
32
Zinc displaces copper from an aqueous solution of copper (ll) salt because
  • A. copper is a transition element
  • B. copper is a moderately reactive metal
  • C. Zinc and copper have reducing prperties
  • D. zinc is more reactive than copper
  • E. zinc reacts with both acids and alkalis
View Answer & Discuss (2) WAEC 1993
33
The alloy used for metal work and plumbing contains
  • A. lead and tin
  • B. iron and carbon
  • C. copper and tin
  • D. aluminium and copper
  • E. lead and antimony
View Answer & Discuss (2) WAEC 1993
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34

Classify each of the following as physical change or a chemical change:

(a) fractional distillation of liquefied air;

(b) cracking of petroleum fractions;

(c) conversion of rhombic sulphur to monoclinic sulphur;

(d) chromatographic separation of chlorophyll.

View Answer & Discuss WAEC 1993
35

(a) Give one disadvantage of:

(i) hard water

(ii) soft water

(b) Explain why the degree of hardness in a sample of clear lime water is higher than in another sample has that been turned milky by carbon (IV) oxide.

View Answer & Discuss WAEC 1993
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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