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Chemistry 2019 JAMB Past Questions

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26

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
27

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
28

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
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29

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
30

What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?

  • A. Fractional crystallization
  • B. Fractional distillation
  • C. Filtration
  • D. Evaporation
View Answer & Discuss (3) JAMB 2019
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