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Chemistry JAMB Past Questions

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1986

Which of the following reactions is an oxidation process?

  • A. 2H\(^+\) + 2e\(^-\) \(\to\) H\(_2\)
  • B. 2O\(^{2-}\) + 4e\(^-\) \(\to\) O\(_2\)
  • C. OCl\(^-\) + H\(_2\)O + 2e\(^-\) \(\to\) 2OH\(^-\) + Cl\(^-\)
  • D. Cl + e\(^-\) \(\to\) Cl\(^-\)
View Answer & Discuss (12) JAMB 2019
1987

If acidified Potassium Dichromate(VI) (K\(_2\)Cr\(_2\)O\(_7\)) acts as oxidizing agent, color changes from

  • A. yellow to green
  • B. orange to green
  • C. yellow to red
  • D. orange to red
View Answer & Discuss (1) JAMB 2019
1988

The heat of formation of ethene, C\(_2\)H\(_4\) is 50 kJmol\(^{-1}\), and that of ethane, C\(_2\)H\(_6\) is -82kJmol\(^{-1}\). Calculate the heat evolved in the process:

C\(_2\)H\(_4\) + H\(_2\) \(\to\) C\(_2\)H\(_6\)

  • A. -122kJ
  • B. -132kJ
  • C. -88kJ
  • D. -60kJ
View Answer & Discuss (3) JAMB 2019
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
1989

Which of the following statements about catalyst is false?

  • A. biological catalysts are called enzymes
  • B. catalyst do not appear in the balanced equation
  • C. catalyst reduce the activation energy for a reaction
  • D. catalysts do not alter the mechanism of the reaction and never appear in the rate low
View Answer & Discuss (6) JAMB 2019
1990

Which of the following does not support the fact that air is a mixture?

  • A. the constituents of air are in a fixed proportion by mass
  • B. it cannot be represented with a chemical formula
  • C. the constituents of air can be separated by physical by physical means
  • D. none of the above
View Answer & Discuss (18) JAMB 2019
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