1. Consider the equilibrium reaction represented by the following equation:

2SO2(g) + O2(g)  ⇌  2SO3(g);     ΔH  =  - xkJmol-1

1. Write an expression for the equilibrium constant Kp.
2. State the effect of each of the following factors on the yield of SO3(g):

I.          decrease in pressure;
II.        increase in temperature;

1. liquefaction of SO3(g).
1. Sketch the energy profile diagram for the forward reaction indicating the position of:
2. reactants and product;
3. activated complex;
4. enthalpy change;
5. activation energy.

    [10 marks]

1.   (i)   Mention two properties of carbon (IV) oxide that are responsible for its

                        use in fire extinguishers.
           (ii)         Write a balanced equation for the reaction of carbon (IV) oxide with lime
             water.
           (iii)        State the function of carbon (IV) oxide in a nuclear reactor.                 
                                                                                                              [5 marks]

1. Give the reason why
1. dilute H2SO4 is not suitable for the preparation of CO2(g) from CaCO3(s);
2. concentrated H2SO4 cannot be used to dry ammonia gas.              [4 marks]

1. On heating 13.15 g of NiSO4.yH2O, 7.75 g of the anhydrous salt was obtained.  Determine the value of y.

[H = I, O = 16, S = 32, Ni = 59)   [6 marks]