Answer :

a. Metal hydroxides are better alternatives than sodium hydrogen carbonate in antacids because Metal hydroxides are insoluble and do not increase the pH above neutrality.


b. Aspirin is used in the prevention of heart-attacks because it has anticlotting property and thus it prevents the clotting of blood.


c. Antihistamines do not affect the secretion of acid in stomach because antihistamines and antacids act on different receptors.


OR


a. Tranquilizers: These are the chemical compounds that are used for the treatment of stress and mental diseases. Example- Equanil.


b. Antibiotics: These are the chemicals synthesised from micro organisms and they either kill or inhibit the growth of other micro-organisms. Example- Penicillin.


c. Non Ionic Detergents: These are the detergents which do not contain any ion in their constituition. Example- Dish washing liquids.


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