Jamb Chemistry 1989 Past Questions and Answers

Question 41:

• JAMB 1989

Three liquids X, Y and Z containing only hydrogen and carbon were burnt on a spoon. X and Y burnt with sooty flames while Z did not. Y is able to discharge the colour of bromine water whereas X and Z cannot. Which of the liquids would be aromatic in nature?

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

Question 42:

• JAMB 1989

It can be deduced from the vapour pressure curves above that

A. Liqiud 1 has the highest boiling point
B. Liquid ll has the highest boiling point
C. Liquid lll has the highest boiling point
D. Liquid lll has the lowest boiling point

Question 43:

• 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 44:

• 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 45:

• 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