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Chemistry 1980 JAMB Past Questions

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21

When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?

  • A. turn moist red litmus paper blue
  • B. turn lime water milky
  • C. blacken lead acetate paper
  • D. rekindle a glowing splint
  • E. burn a sqeakly pop
View Answer & Discuss (5) JAMB 1980
22
In which of the following is the oxidation state of oxygen different from its value in water?
  • A. OH-
  • B. H3O+
  • C. O-
  • D. H2O2
  • E. SO2
View Answer & Discuss (6) JAMB 1980
23
Which of the following silver halides is readily soluble in ammonium hydroxide?
  • A. Agl
  • B. AgBr
  • C. AgCl
  • D. AgF
  • E. None of the above
View Answer & Discuss (6) JAMB 1980
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24
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?
  • A. oxidation
  • B. hydrolysis
  • C. dissociation
  • D. reduction
  • E. disproportionation
View Answer & Discuss (4) JAMB 1980
25
Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?
  • A. Electrons flow towards the zinc rod
  • B. The zinc rod dissolves
  • C. The temperature of the soil changes
  • D. The blue colour of the solution gradually disappears
  • E. Copper metal is deposited
View Answer & Discuss (5) JAMB 1980
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