question_answer 14)

Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer: Biogas, Citric acid. Penicillin and Curd.  

Answer:

Above stated chemicals in the decreasing of their importance are: Penicillin > Biogas > Curd > Citric acid. It is so because: (i) Penicillin, commonly called wonder drug, is a wide-spectrum antibiotic and is used to control a number of human diseases like syphilis, gonorrhoea, diphtheria, lung infections, etc. (ii) Biogas, produced from dung of cattle by themethanogens, is an alternative source of energy especially in the rural areas. Its production also provides slurry which can be used as a manure to increase the soil fertility and crop yield. (iii) Curd: It is a milk product very commonly used in almost all the houses. (iv) Citric acid is least important of these.