Chemistry Past Questions and Answers

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:

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:

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

A 300, 500
B 500, 300
C -300, -500
D -500, -300

Question 619:

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

A 300, 500
B 500, 300
C -300, -500
D -500, -300

Question 620:

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