The kraft temperature (TK) and CMC of a soap are respectively 25°C and 10-4 mol L-1. Then that soap forms micelle at

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The kraft temperature (T_K) and CMC of a soap are respectively 25°C and 10^-4 mol L^-1. Then that soap forms micelle at

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20°C and 10^-6 molL

28°C and 10^-3 molL

20°C and 10^-3 molL

28°C and 10^-5 molL

answer is B.

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Detailed Solution

The formation of micelles takes place only above a particular temperature called Kraft temperature (T_k) and above a particular concentration called critical micelle concentration (CMC). On dilution, these colloids revert to individual ions. Surface-active agents such as soaps and synthetic detergents belong to this class. For soaps, the CMC is 10^–4 to 10^–3 mol L^–1.

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