Question 616:

• JAMB 1989

In the above set up substances X and Y are respectively

A. Lime water copper (ll) tetraoxosulphate (lV)
B. Potassium trioxocarbonate and alkaline pyrogallol
C. Potassium hydroxide and alkaline pyrogallol
D. Potassium trioxocarbonate (lV) and concentrated tetraoxosulphate (IV) acid

Question 617:

• JAMB 1989

Which of the curves in the above graph illustrates the behaviour of an ideal gas?

A. W
B. X
C. Y
D. Z

Question 618:

• 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 619:

• 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 620:

• 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