(a)(i)



(ii) - used as germicide/disinfectant/sterilization/antiseptic/insecticides

bleaching of materials/wood pulp/textiles
commercial production of HCl
production of polymers/PVC/plastics
production of chlorinated chemicals e.g. CHCl${}_3$, CCl${}_4$
in medicine
production of dyes


(b) Water gas is CO + H${}_2$ steam is mixed with water gas and passed over heated catalyst of iron (III) oxide or chromium (III) oxide at 450${}^o$ C
The CO in water gas is converted to CO${}_2$ with further yield of hydrogen

The CO${}_2$ is removed by dissolving the mixture in water / NaOH/KOH/Ca(OH)${}_2$ solutions under pressure


(c) (i) Bauxite
(ii) - To produce aluminium oxide/alumina.
- To prevent poisoning of the electrode.
(iii) Carbon/ graphite
(iv) - It is added to reduce some of the energy (costs) involved in extracting aluminium
- to increase the electrical conductivity of alumina
- to lower the melting points to of the alumina


(d) Coke
- Coal tar
- Coal gas
- ammoniacal liquor