During cleaning of dirt, using sodium stearate, a micelle is formed. The nature of micelle is

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Anionic

Cationic

Neutral

Unknown

answer is C.

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Detailed Solution

When dissolved in water, sodium stearate dissociates into RCOO^- and Na⁺ ions. RCOO^- ions consist of two parts: a long hydrocarbon chain (R) which is hydrophobic and a polar carboxylate group (RCOO^-), which is hydrophilic.

When concentration of the ions is increased and it reaches a critical micelle concentration, the anions begin to aggregate. The ions aggregate to form a spherical shape with their hydrocarbon chains (hydrophobic) pointing towards the center of the sphere and the carboxylate ion part (hydrophilic) remaining outward on the surface of the sphere. The aggregate formed is known as ionic micelle.

Hence the correct option is (C).

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