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Chemistry 1993 WAEC Past Questions

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11
In which of the following changes is ∆S negative ?
  • A. H2O(l) → H2O(s)
  • B. C(s) + 1/2O2,/sub>(g) → CO(g)
  • C. PCI5(g) → PCl3(g) + Cl2(g)
  • D. NaCl(s) + aq →Na+ (aq) + Cl- (aq)
  • E. NH3(g) + HCl(g)
View Answer & Discuss (1) WAEC 1993
12
Chlorine is is used in water treatment as
  • A. a germicide
  • B. a decolorizing agent
  • C. an antioxidant
  • D. a coagulating agent
  • E. an aerating agent
View Answer & Discuss (1) WAEC 1993
13
Which of the following pieces of deposited if a current of 10A was passed through a solution of copper(ll) salt for 965 seconds? (1F = 96500 C)
  • A. 0.005 mole
  • B. 0.025 mole
  • C. 0.05 mole
  • D. 1.00 mole
  • E. 1.05 mole
View Answer & Discuss (4) WAEC 1993
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
14
Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
  • A. group lV elements
  • B. group l metals
  • C. transition metals
  • D. alkaline earths
  • E. the halogens
View Answer & Discuss WAEC 1993
15
Consider the reaction represented by the following equation CaCI2 (aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the precipitate of CaC 2O4 formed?
  • A. Stirring the mixture vigorously
  • B. Adding more calcium chloride solution
  • C. lncreasing the concentration of the ethanedioic acid
  • D. Adding concentrated hydrochloric acid
  • E. Adding some distilled water
View Answer & Discuss (2) WAEC 1993
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