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(i) Bithinol is added to soap to reduce the odour produced by bacterial decomposition of organic matter on the skin.
(ii)
is a better antacid than sodium bicarbonate because, it is insolute and does not increase the 
above neutrality.
(iii) Soaps are biodegradable whereas detergents are non bio-degradable, because detergents have generally highly branched hydrocarbon chains. the side chain stops bacteria from attacking breaking the chains, hence, they are non- biodegradable while in soaps, it is not the case.