(a) Which one of the following is a food preservative ? (3 marks)
Equanil, Morphine, Sodium benzoate
(b) Why is bithional added to soap ?
(c) Which class of drugs is used in sleeping pills ?
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(a) Sodium Benzoate : It is a food preservative.
(b) Bithional acts as deodorant in soaps, hence it works as an antiseptic agent and reduces the
odours produced by bacterial decomposition of organic matter on the skin.
(c) Tranquilizers like barbiturates are used in sleeping pills.