Q.

Which one of the following is an anionic detergent?

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a

Cetyl trimethyl ammonium bromide

b

Sodium stearate

c

Sodium palmitate

d

Sodium dodecyl benzene sulphonate

answer is A.

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Detailed Solution

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  • Sodium dodecyl benzene sulphonate is an anionic detergent. 
  • Anionic detergents contain a negatively charged hydrophilic group, such as a sulfate, sulfonate, or carboxylate group, which gives them their characteristic anionic charge. 
  • Sodium palmitate and sodium stearate are both soaps, which are made from the saponification of fatty acids and are classified as nonionic detergents. 
  • Cetyl trimethyl ammonium bromide is a cationic detergent, which contains a positively charged hydrophilic group.
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