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2111

Which of the following will displace copper from a solution of copper (ll) salt?

  • A. Aluminium ions
  • B. Magnesium
  • C. Silver
  • D. Zinc ions
View Answer & Discuss (11) WAEC 2000
2112

What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O

  • A. 1
  • B. 6
  • C. 8
  • D. 12
View Answer & Discuss (2) WAEC 2000
2113

In which of the following is the oxidation number of sulphur equal to -2?

  • A. S8
  • B. H2S
  • C. SO 2
  • D. SO 3 2-
View Answer & Discuss WAEC 2000
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2114

An iron nail placed in a solution copper (ll) tetraoxosulphate (VI) is soon covered with a deposit of copper. Which of the following equations represents the reactions ?

  • A. Fe 2+ (aq) + Cu(s) → Fe 3+ + Cu 2+ (aq)
  • B. Fe 2+ (aq) + Cu(s) → Fe(s) + Cu2+ (aq)
  • C. Fe (s) + Cu2+ (aq) → Fe2+(aq) + Cu2+ (aq)
  • D. Fe(s) + Cu2+ → Fe2+(aq) + Cu(s)
View Answer & Discuss WAEC 2000
2115

0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI

  • A. contains more ions
  • B. is neutral to litmus
  • C. has a lower molar mass
  • D. has a higher pH
View Answer & Discuss (1) WAEC 2000
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