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Chemistry 2021 WAEC Past Questions

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16

What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm\(^{2}\) cylinder?

[R = 0.082 atm dm\(^{3}\) mol\(^{-1}\) K\(^{-1}\)]

 

  • A. 0.32
  • B. 1.56
  • C. 3.13
  • D. 31.25
View Answer & Discuss (1) WAEC 2021
17

The basic property of salts used as drying agents is by?

  • A. efforescence
  • B. high melting point
  • C. hygroscopy
  • D. low solubility
View Answer & Discuss (8) WAEC 2021
18

What would be observed when aqueous ammonia is added in drops and then in excess to a solution of copper(II) ions?

  • A. blue precipitate is formed which is soluble in excess ammonia
  • B. brick red precipitate is produced which is insoluble in excess ammonia
  • C. which precipitate is formed which is excess in ammonia
  • D. green precipitate is formed which is insoluble in excess ammonia
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19

When CuSO\(_{4(aq)}\) is added to Pb(NO\(_{3}\))\(_{2(aq)}\)--------

  • A. there would be no visible change
  • B. a blue precipitate would be formed
  • C. the resulting solution would become colourless
  • D. a white precipitate would be formed
View Answer & Discuss (2) WAEC 2021
20

Consider the structure above

How many carbon atoms does the parent chain contain? 

  • A. 5
  • B. 4
  • C. 3
  • D. 2
View Answer & Discuss (17) WAEC 2021
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