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Chemistry Past Questions

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1571

The above diagram gives the potential energy profile of the catalyst and uncatalysed reactions of X(g) + Y(g) → XY(g). Deduce the respective activation energies in KJ of the catalysed and uncatalysed reverse reactions: XY(g) → X(g) + Y(g)

  • A. 300, 500
  • B. 500, 300
  • C. -300, -500
  • D. -500, -300
View Answer & Discuss (22) JAMB 1989
1572

If in the graph above 1 dm 3 of a saturated solution of KCL is cooled from 80°C, the mass of crystals deposited will be
[K = 39, Cl = 35.5]

  • A. 7.45 g
  • B. 14.90 g
  • C. 74.50 g
  • D. 149.00 g
View Answer & Discuss (21) JAMB 1989
1573

The above graph shows a typical heating curve from the solid phase through the liquid phase to the gaseous phase of a substance. Which part of the curve shows solid and liquid in equilibrium?

  • A. T
  • B. U
  • C. X
  • D. Y
View Answer & Discuss (6) JAMB 1989
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1574

Use the figure above to answer this question. Which of the following compounds is an isomer of the compound

  • A. A
  • B. B
  • C. C
  • D. D
View Answer & Discuss (16) JAMB 1989
1575

Use the figure above to answer this question. Which of the following is NOT an isomer of the compound?

  • A. A
  • B. B
  • C. C
  • D. D
View Answer & Discuss (11) JAMB 1989
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