Which one is an anionic surface active agent | vedclass

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Question

(A) Surface active agents (surfactants) are classified based on the charge of the polar head group in the aqueous solution.$A$. Sodium dodecyl benzene

Vedclass · Accepted Answer

Sodium dodecyl benzene sulphonate

Vedclass · Answer

(A) Surface active agents (surfactants) are classified based on the charge of the polar head group in the aqueous solution.$A$. Sodium dodecyl benzene sulphonate $(C_{12}H_{25}-C_6H_4-SO_3^-Na^+)$ dissociates to give a large anionic part $(C_{12}H_{25}-C_6H_4-SO_3^-)$,hence it is an anionic surfactant.$B$. Cetyl trimethyl ammonium chloride $([C_{16}H_{33}N(CH_3)_3]^+Cl^-)$ dissociates to give a large cationic part,hence it is a cationic surfactant.$C$. Cetyl pyridinium chloride $([C_{16}H_{33}NC_5H_5]^+Cl^-)$ also dissociates to give a large cationic part,hence it is a cationic surfactant.Therefore,sodium dodecyl benzene sulphonate is the correct anionic surfactant.

Which one is an anionic surface active agent at a concentration greater than the critical micelle concentration?

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