1. (a ) Define the term compound. (b) State two conditions necessary for the cracking of petroleum fractions. (c) Name two transition elements that are used...

1. (a ) Define the term compound.                                                

(b) State two conditions necessary for the cracking of petroleum fractions.            

(c) Name two transition elements that are used as catalyst.     
(d) (i) Write an equation for the reaction between zinc dust and trioxonitrate (V) solution.

   (ii) Which of the reactants in 1(d)(i) is:
I. reduced;
II. oxidized.                                                            

(e) Two isotopes of oxygen 16O and 18O have relative abundance of 90 % and 10 % respectively. Calculate the relative atomic mass of oxygen.            

(f)  List two ores of iron.                   

(g) (i)   What is biotechnology?                                 
(ii)   Name one product that can be obtained using biotechnology. 
(h) Define the term element.                                                          

(i)  State two sources of methane in the atmosphere.                    

(j)  Explain briefly why the trend of the boiling points for group VII elements is in the order I\(_2\) > Brl\(_2\)> Cl\(_2\).