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Chemistry 2018 WAEC Past Questions

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36

The change in the oxidation state of iron in the reaction represented by the equation:  \(2FeCl_{3} + H_{2}S \to 2FeCl_{2} + 2HCl + S\)  is

  • A. +2 to +3
  • B. 0 to +2
  • C. +3 to +2
  • D. +3 to 0
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37

Which of the following methods can be used to seperate blood cells from plasma?

  • A. Centrifugation
  • B. Filtration
  • C. Chromatography
  • D. Distillation
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38

Which of the following statements is true about ionic radius? Ionic radius

  • A. increases as nuclear charge increases
  • B. decreases as nuclear charge increases
  • C. decreases as nuclear charge decreases
  • D. remains constant as nuclear charge increases
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39

Analysis of a hydrocarbon shows that it contains 0.93g of Carbon per gram of the compound. The mole ratio of carbon to hydrogen in the compound is [H = 1.0, C=12.0]

  • A. 1:1
  • B. 1:2
  • C. 2:1
  • D. 2:3
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40

The law of definite proportions states that

  • A. pure samples of the same compound contain the same elements combined in the same proportion by mass
  • B. pure samples of substances are in the same proportion by mass
  • C. chemical compounds are pure because they contain the same elements
  • D. matter can neither be created nor destroyed.
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