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Chemistry 2021 WAEC Past Questions

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6

If humid air is polluted by chlorine discharged, the air can be restored by sprinkling

  • A. solid MnO\(_{2}\)
  • B. acidified KMnO\(_{4}\)
  • C. acidified FeSO\(_{4}\)
  • D. saturated NaCl(aq)
View Answer & Discuss (6) WAEC 2021
7

The alkanol represented by the structure above is

  • A. primary and dihydric
  • B. secondary and monohydric
  • C. tertiary and dihydric
  • D. secondary and dihydric
View Answer & Discuss (16) WAEC 2021
8

Which of the following pairs of compounds would form a precipitate when their aqueous solutions are mixed?

  • A. NaCl and KNO\(_{3}\)
  • B. KCL and NaNO\(_{3}\)
  • C. K\(_{2}\)SO\(_{4}\) and BaCl\(_{2}\)
  • D. NH\(_{4}\)NO\(_{3}\) and CO\(_{3}\)
View Answer & Discuss (4) WAEC 2021
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9

Which of the following illustrates the variation of the rate of evolution of gas from a given length of magnesium ribbon (y-axis) with an increase in the concentration of the added (x-axis)?

  • A. I
  • B. II
  • C. III
  • D. IV
View Answer & Discuss (2) WAEC 2021
10

Which of the graphs illustrates the variation of the pH of a given volume of strong acid solution (y-axis) with the volume of strong base titrated against its (x-axis)?

  • A. I
  • B. II
  • C. III
  • D. IV
View Answer & Discuss (1) WAEC 2021
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