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CMC (Critical Micelle Concentration) is...

CMC (Critical Micelle Concentration) is

A

the concentration at which micellization starts

B

the concentration at which micelle starts behaving like an electrolyte

C

the concentration at which dispersed phase is separated from dispersiion medium

D

the cooncentration at which a colloid is converted to suspension

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Micelles**: - Micelles are aggregates formed by surfactant molecules in a solution when the concentration of the surfactant exceeds a certain threshold. 2. **Defining CMC**: - The Critical Micelle Concentration (CMC) is the specific concentration of surfactants in a bulk phase, above which micelles start to form. 3. **Process of Micellization**: - Micellization is the process where surfactant molecules organize themselves into micelles. This occurs when the concentration of surfactants surpasses the CMC. 4. **Evaluating Options**: - The question provides several options regarding the definition of CMC. We need to assess each option: - Option A: CMC is the concentration at which micellization starts. (This is correct.) - Option B: The concentration at which micelles start behaving like electrolytes. (This is incorrect.) - Option C: The concentration at which the dispersed phase is separated from the dispersion medium. (This is incorrect.) - Option D: The concentration at which colloid is converted to suspension. (This is incorrect.) 5. **Conclusion**: - Based on the evaluation, the correct definition of CMC is that it is the concentration at which micellization starts. **Final Answer**: CMC (Critical Micelle Concentration) is the concentration at which micellization starts. ---
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