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Question

Which of the following statements are correct? 
(a) Cationic detergents have germicidal properties 
(b) Bacteria can degrade the detergents containing highly branched chains 
(c) Some synthetic detergents can give foam even in ice cold water 
(d) Synthetic detergents are not soaps 


Solution

Answers: (a), (c), and (d).

(a) Cationic detergents are quarternary ammonium salts of amines with acetates, chlorides or bromides as anions. These detergents have germicidal' properties. Hence, option (a) is correct. 
(b) Bacteria can not degrade the detergents containing highly branched chains, therefore, in most of the detergents used these days, the branching is kept to a minimum so that the detergents become easily biodegradable. Hence , option (b) is incorrect. 
(c) Some synthetic detergents can give foam even in ice cold water. Hence, option (c) is correct. 
(d) Synthetic detergents are cleansing agents which have all the properties of soaps, but which actually do not contain any soap. Hence, option (d) is correct. 
 


Chemistry
NCERT Exemplar
Standard XII

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