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Thursday, 02 April 2026
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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 16:
JAMB 1999
The correct order of increasing oxidation number of the transition metal ions for the compounds K2Cr2O7, V2O5 and KMnO4 is
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  • A V2O5 < K2Cr2O7 < KMnO4
  • B K2Cr2O7 < KMnO4 < V2O5
  • C KMnO4 < K2Cr2O7 < V2O5
  • D KMnO4 < V2O5 < K2Cr2O7
View Answer & Explanation
Question 17:
JAMB 1999
The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is
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  • A CO, CO2 and SO2
  • B CO, HCL and SO2
  • C CO, CO2 and HCL
  • D SO2, CO2 and HCL
View Answer & Explanation
Question 18:
JAMB 1999
What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?
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  • A A white precipitate is formed
  • B A green precipitate is formed
  • C The mixture remains colourless
  • D The mixture turns reddish brown
View Answer & Explanation
Question 19:
JAMB 1999
The solution with the lowest pH value is
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  • A 5 ml of (m/10) HCL
  • B 10 ml of (m/10) HCL
  • C 15 ml of (m/5) HCL
  • D 20 ml of (m/8) HCL
View Answer & Explanation
Question 20:
JAMB 1999
The solubility product of Cu(IO3)2 is 1.08 * 10-7. Assuming that neither ions react appreciable with water to form H+ and OH-, what is the solubility of this salt?
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  • A 2.7 * 10-8 mol dm-3
  • B 9.0 * 10-8 mol dm-3
  • C 3.0 * 10-3 mol dm-3
  • D 9.0 * 10-3 mol dm-3
View Answer & Explanation

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