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Chemistry WAEC Past Questions

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551
Consider the electrochemical cell represented below Zn(s)/Zn2+(aq)//Cu2+(aq)/Cu(s). Which of the following equations describes the reaction occurring in the cell?
  • A. Cu(s) + Zn2+(aq) →Cu2+(aq) + Zn(s)
  • B. Cu(s) + Zn(s) →Cu2+(aq) + Zn2+(aq)
  • C. Zn(s) + Cu2+(aq) →Zn2+(aq) + Cu(s)
  • D. Zn2+(aq) +Cu2+(aq) → Zn(s) + Cu(s)
View Answer & Discuss WAEC 2003
552
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z.
Which of the metals cannot displace Y from an aqueous solution of its salt?
  • A. V
  • B. W
  • C. X
  • D. Z
View Answer & Discuss WAEC 2003
553
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z.
Which of the metals is most likely extracted by the electrolysis of its fused chloride?
  • A. V
  • B. W
  • C. X
  • D. Z
View Answer & Discuss (4) WAEC 2003
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554
Which of the following statements is/are correct about tin plating? l The electrolyte must be a soluble salt of tin ll. the objective to be plated is made the cathode lll. The anode is made of tin lV. The negative electrode dissolves
  • A. L only
  • B. l and ll only
  • C. l,ll and lll only
  • D. l, ll and lV only
View Answer & Discuss (1) WAEC 2003
555
Determine the amount of electrons needed to deposit 6.4g of copper during the electrolysis of copper (ll) tetraoxosulphate (IV) solution [Cu = 64]
  • A. 0.10 mole
  • B. 0.20 mole
  • C. 1.0 mole
  • D. 2.0 mole
View Answer & Discuss (7) WAEC 2003
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