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Chemistry Past Questions

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Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
56
Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?
  • A. HF(g)
  • B. NH3(g)
  • C. CH4(g)
  • D. HCl(g)
View Answer & Discuss (10) JAMB 1999
57
0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up of 0.50 dm3. If 15.0 cm3 of the solution requires 12.50 cm3 of aqueous sodium trioxocarbonate (IV) for neutralization, calculate the concentration of the alkaline solution
  • A. 0.30 mol dm3
  • B. 0.40 mol dm3
  • C. 0.50 mol dm3
  • D. 0.60 mol dm3
View Answer & Discuss (13) JAMB 1999
58
The correct order of increasing oxidation number of the transition metal ions for the compounds K2Cr2O7, V2O5 and KMnO4 is
  • A. V2O5 < K2Cr2O7 < KMnO4
  • B. K2Cr2O7 < KMnO4 < V2O5
  • C. KMnO4 < K2Cr2O7 < V2O5
  • D. KMnO4 < V2O5 < K2Cr2O7
View Answer & Discuss (15) JAMB 1999
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59
The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is
  • A. CO, CO2 and SO2
  • B. CO, HCL and SO2
  • C. CO, CO2 and HCL
  • D. SO2, CO2 and HCL
View Answer & Discuss (17) JAMB 1999
60
What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?
  • 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 & Discuss (9) JAMB 1999
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