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Chemistry 1989 WAEC Past Questions

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21
Which of the following is used extensively in manufacturing photographic chemicals?
  • A. Aluminium chloride
  • B. Zinc chloride
  • C. Silver chloride
  • D. Mercury (ll) chloride
  • E. lron (ll) chloride
View Answer & Discuss WAEC 1989
22
Given that 1 mole of carbon -12 weighs 12.0g, how many atoms are there in 24.0g magnesium? (C = 12, Mg = 24, NA = 6.02 x 10 23mol-1)
  • A. 1/2 x 6.02 x 10 23
  • B. 1 x 6.02 x10 23
  • C. 2 x 6.02 x 10 23
  • D. 3x 6.02 x 10 23
  • E. 4x 6.02 x 10 23
View Answer & Discuss (1) WAEC 1989
23

If sulphur is dissolved in carbon (IV) sulphide and  the solution allowed to evaporate the allotrope of sulphur formed is

  • A. plastic sulphur
  • B. amorphous sulphur
  • C. rhombic sulphur
  • D. monoclinc sulphur
  • E. colloidal sulphur
View Answer & Discuss (6) WAEC 1989
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24
If sulphur is dissolved in carbon (IV) sulphide and the solution is allowed to evaporate, the allotrope of sulphur formed is
  • A. plastic sulphur
  • B. amorphous sulphur
  • C. rhombic sulphur
  • D. monoclinc sulphur
  • E. colloidal sulphur
View Answer & Discuss WAEC 1989
25

Given that for the reaction. N2(g) + 3H2(g) ⇌ 2NH3(g) ∆H = -92kJ. What is the enthalpy of formation of ammonia from its elements?

  • A. -46KJ mol -1
  • B. -184KJmol -1
  • C. -92KJmol -1
  • D. 184KJmol -1
  • E. +46KJmol -1
View Answer & Discuss (3) WAEC 1989
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