Answer the following questions : (3 marks)
(i) Why do soaps not work in hard water ?
(ii) What are the main constituents of dettol ?
(iii) How do antiseptics differ from disinfectants ?
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(i) Hard water contains insoluble calcium and magnesium chlorides which forms insoluble
precipitate (scum) with soap and thus cannot be rinsed off easily.
(ii) Dettol is mixture of chloroxylenol and -terpineol in a suitable solvent.