(a) (i)  List the two gaseous fuels produced from coke.
(ii) Which of the two fuels listed in 5(a)(i) is a better fuel?
(iii) Give reasons for your answer in 5(a)(ii)
(iv) Write a balanced equation for the production of each of the fuels.      [9 marks]

(b)(i)  Differentiate between thermosets and thermoplastics.
(ii)   Give one example of:
I.   thermosets;
II.  thermoplastics.

(iii)  State three properties of plastics.

(c)(i) State the method of collecting gases which are denser than air.
(ii)  Name two gases that could be used to perform the fountain experiment in the laboratory.
(iii)  State the physical properties of the gases named in 5(c)(ii) which makes them suitable for the experiment.   [4 marks]
(d) (i)  State two compounds that could be used to test for water.
(ii)  Give three disadvantages of hard water.