Jamb Chemistry 1989 Past Questions and Answers

Question 46:

• JAMB 1989

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

Question 47:

• JAMB 1989

If in the graph above 1 dm ³ of a saturated solution of KCL is cooled from 80^oC, 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

Question 48:

• JAMB 1989

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

Question 49:

• JAMB 1989

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

Question 50:

• JAMB 1989

Use the figure above to answer this question. Which of the following is NOT a monomer?

A. A
B. B
C. C
D. D