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Chemistry 1990 JAMB Past Questions

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1
Which of the following is a physical change?
  • A. The bubbling of chlorine into water
  • B. The bubbling of chlorine into a jar contanining hydrogen
  • C. The dissolution of sodium chloride in water
  • D. The passing of steam over heated iron
View Answer & Discuss (6) JAMB 1990
2

In a reaction: \(SnO_{2} + 2C → Sn + 2CO\) the mass of coke containing 80% carbon required to reduce 0.302 kg of pure tin oxide is?
(Sn - 119, O - 16, C - 12).

  • A. 0.40 kg
  • B. 0.20 kg
  • C. 0.06 kg
  • D. 0.04 kg
View Answer & Discuss (22) JAMB 1990
3

Cr\(_2\)O\(_7\)\(^{2-}\) + 6Fe\(^{2+}\) + 14H\(^+\) → 2Cr\(^{3+}\) +6Fe\(^{3+}\) + 7H\(_2\)O. In the above , the oxidation number of chromium changed from?

  • A. +7 to +3
  • B. +6 to +3
  • C. +5 to +3
  • D. -2 to +3
View Answer & Discuss (18) JAMB 1990
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4
In the reaction 1O-3 + 5l- + 6H+ → 312 + 3H2O, the oxidizing agent is?
  • A. H+
  • B. l-
  • C. 1O-
  • D. l2
View Answer & Discuss (11) JAMB 1990
5

Fe\(_2\)O\(_{3(s)}\) + 2Al\(_{(s)}\) → Al\(_2\)O\(_3\) + 2Fe\(_{(s)}\). If the heats of formation of Al\(_2\)O\(_3\) and Fe\(_2\)O\(_3\) are - 1670 kJmol\(^{-1}\) and - 822 kJmol\(^{-1}\) respectively, the enthalpy change in kJ for the reaction is ?

  • A. +2492
  • B. +848
  • C. -848
  • D. -2492
View Answer & Discuss (10) JAMB 1990
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