(a)        (i)  List two gaseous pollutants that can be generated by burning coal.
            (ii)   Explain briefly why coal burns more easily when it is broken into pieces than when it is in lumps. 
            (iii   What gas is responsible for most of the explosions in coal mines?
          (iv) Name the non-volatile residue left behind after the destructive distillation of coal.                                                                                                                          

(b)        State one oxide in each case which:  
(i)         is used in bleaching;
(ii)        oxidizes hot concentrated HCl to chlorine;
(iii)       dissolves in water to give a solution with pH greater than 7;
(iv)       reacts with NaOH and also with HCl;
(v)        is a reddish-brown gas.                                                                  

 

(c)        (i)  Write a balanced chemical equation for the reaction between chlorine gas and iron(II) chloride solution.
(ii)        State the type of reaction in (c)(i).
(iii)       Give a reason for your answer in (c)(ii).                                         

(d)       Consider the following set-up:

 

(i)         Identify A and B.
(ii)        Write a balanced chemical equation for the reaction.
(iii)       Name the gas produced.
(iv)       Why was the flask tilted downwards?
(v)        What is the:
            (I)   function of B in the experiment;
            (II)  method of collection of the gas?                                                        

(e)        Give one product obtained from refining petroleum that is solid.