Answer:
(a)
Transquilizers: The chemical substances used to cure mental diseases are
Transquilizers. They reduce anxiety and tension, e.g., Calmpose, veronal etc.
1
(b)
Preservatives: Chemical substances which are added to food to improve its
keeping properties, appearance, taste, odour and food value are called
preservatives, e.g. Sodium benzoate. 1
(c) Analgesics:
Those drugs which relieve or decrease pain are termed as analgesics, e.g., Aspirin,
analgin, saridon
etc. 1
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