(a)(i) Outline the steps involved in the purification of water for town supply.

(ii) Give two cations that can cause hardness in water.

(iii) State two disadvantages of hardness of water.

(iv) List two sources of water pollution.

 

(b)(i) Explain briefly why water is a good solvent for sodium chloride but not for oil.

(ii) State the function of H\(_2\)SO\(_4\) in each of the following reaction equations:

(i) C\(_2\)H\(_5\)OH\(_{(l)}\) \(\to\)  C\(_2\)H\(_{4(g)}\)

(ii) MgO\(_{(s)}\) + H\(_2\)SO\(_4\)\(_{(aq)}\) —> MgSO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\)

(iii) C\(_{(s)}\) + conc. H\(_2\)SO\(_4\) --> CO\(_{(g)}\) + SO\(_{2(g)}\) + H\(_2\)O\(_{(l)}\)

 

(c) (i) Give the two products formed when chlorine water is exposed to sunlight.

(ii) I. Which of the compounds is suitable for the preparation of standard alkaline solution?

II. Give a reason for your answer in (c)(ii)I