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Chemistry 1989 JAMB Past Questions

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16
The substance ZnO dissolves in sodium hydroxide solution and mineral acid solution to give soluble products in each case. ZnO is therefore referred to as
  • A. an allotropic oxide
  • B. an amphoteric oxide
  • C. a peroxide
  • D. a dioxide
View Answer & Discuss (2) JAMB 1989
17
An acid and its conjugate base
  • A. can neutralise each other to form a salt
  • B. differ only by a proton
  • C. differ only by the opposite charges they carry
  • D. are always neutral substances
View Answer & Discuss (10) JAMB 1989
18
The same current is passed for the same time through solutions of AgNO3 and CuSO4 connected in series. How much silver will be deposited if 1.0 g of copper is produced?
[Cu = 63.5, S = 32, O = 16, Ag = 108, N = 14]
  • A. 1.7 g
  • B. 3.4 g
  • C. 6. 8 g
  • D. 13. 6 g
View Answer & Discuss (13) JAMB 1989
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19

What is discharged at the cathode during the electrolysis of copper (ll) tetraoxosulphate (VI) solution?

  • A. Cu 2+ only
  • B. H + only
  • C. Cu 2+ and H
  • D. Cu 2+ and SO 2-
View Answer & Discuss (16) JAMB 1989
20
An element, Z froms an anion whose formula is [Z(CN)6]y. If Z has an oxidation number of +2, what is the value of y?
  • A. - 2
  • B. - 3
  • C. - 4
  • D. - 5
View Answer & Discuss (8) JAMB 1989
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