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Chemistry 2022 WAEC Past Questions

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16

Determine the quantity of electricity used when a current of 0.20 amperes is passed through an electrolytic cell for 60 minutes.

  • A. 12C
  • B. 120C
  • C. 360C
  • D. 720C
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17

Oxochlorate(I) acid is used as a bleaching agent because it is

  • A. a weak acid
  • B. a reducing agent.
  • C. an oxidizing agent
  • D. a strong acid.
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18

The IUPAC name for CH\(_{3}\)CHCH\(_{3}\)CHCLCHCH\(_{3}\)CH\(_{2}\)CH\(_{3}\) is

  • A. 2, 4 - dimethyl - 3 - chlorohexane
  • B. 3, 5 - dimethyl - 4 - chlorohexane
  • C. 4 - chloro - 3, 5 - dirnethylhexane
  • D. 3 - chloro - 2, 4 - dimethylhexane
View Answer & Discuss (3) WAEC 2022
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19

A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. The gas evolved could turn

  • A. acidified K\(_{2}\)Cr\(_{2}\)O\(_{7}\) solution colourless
  • B. acidified KMnO\(_{4}\) solution colourless
  • C. Fe(NO\(_{3}\))\(_{2}\) solution green
  • D. Pb(NO\(_{3}\))\(_{2}\) paper black
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20

If 5.0 g of marble reacts with 25.0 cm3 hydrochloric acid, which of the following combinations has the fastest reaction rate?

  • A. Marble chips and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
  • B. Marble chips and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
  • C. Powdered marble and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
  • D. Powdered marble and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
View Answer & Discuss (2) WAEC 2022
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