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Below critical micelle concentration (C...

Below critical micelle concentration (CMC):

A

salt behaves as normal electrolyte

B

substance like grease , fat dissolve by emulsification

C

the viscosity of solution is very high

D

surfactant molecules undergo association to form cluster

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To solve the question regarding the conditions below the critical micelle concentration (CMC), we will analyze the definition of CMC and evaluate each option provided. ### Step-by-Step Solution: 1. **Define Critical Micelle Concentration (CMC)**: - CMC is defined as the concentration of surfactant in a bulk phase above which aggregates of surfactant molecules (micelles) start to form. Below this concentration, surfactant molecules exist primarily as individual molecules in the solution. 2. **Evaluate Each Option**: - **Option A: Salt behaves as a normal electrolyte**. - Below the CMC, surfactants are not yet forming micelles, and salts can behave as normal electrolytes. This is a correct statement. - **Option B: Substance like grease fat dissolved by emulsification**. - Emulsification typically occurs when micelles are formed, which is above the CMC. Therefore, this option is not correct for conditions below CMC. - **Option C: The viscosity of the solution is very high**. - The viscosity of the solution increases significantly after the formation of micelles, which occurs above the CMC. Thus, this option is also incorrect for below CMC conditions. - **Option D: Surfactant molecules undergo association to form clusters**. - This statement refers to the formation of micelles, which occurs above the CMC. Therefore, this option is also incorrect for below CMC conditions. 3. **Conclusion**: - After evaluating all options, only **Option A** is correct. Below the CMC, salt behaves as a normal electrolyte, while the other options pertain to conditions that occur above the CMC. ### Final Answer: The correct answer is **Option A: Salt behaves as normal electrolyte**. ---
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