Question

(i) What class of drug in Ranitidine?
(ii) If water contains dissolved $C{a}^{2+}$ ions, out of soaps and synthetic detergents which will you use for cleaning clothes?
(iii) Which of the following is an antiseptic?
$0.2$% phenol, $1$ % phenol

Answer 1

1. Ranitidine is in a group of drugs called histamine-2 blockers.
2. Synthetic detergents are preferred for cleaning clothes when soaps are dissolved in water containing calcium ions, these ions form insoluble salts that are of no further use. Calcium hydrogen carbonate present in water will furnish $C{a}^{2+}$ ions which cause hardness in water.
3. Phenol on account of corrosive action, produces blisters when comes in contact with skin. It is poisonous and is good antiseptic (0.2%) and disinfectant (1%).