(i) What class of drug is Ranitidine?

(ii) If water contains dissolved Ca²⁺ 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

(i) Ranitidine belongs to Antihistamines class of drugs.

(ii) If water contains Ca²⁺ ions then out of soaps and synthetic detergents, we will use synthetic detergents. In case of soaps, Ca²⁺ ions form insoluble calcium soaps when sodium or potassium soaps are dissolved in hard water.

2C₁₇H₃₅COONa + CaCl₂  ---> 2NaCl + (C₁₇H₃₅COO)₂Ca

  Soap                                         insoluble calcium sterate soap

Whereas the synthetic detergents can be used in both soft and hard water.

(iii) 0.2% phenol is an antiseptic.