Question

Formation of micelles takes place only above a particular temperature. This temperature is known as:

• A. Kraft temperature
• B. Boyle temperature
• C. Critical temperature
• D. Inversion temperature

Hint:

Micelle formation requires a critical concentration (CMC) and a minimum temperature (Krafft temp).

Answer 1

The Correct Option is A

Step 1: Picture what a micelle is.
A micelle is a cluster of soap or detergent molecules. The greasy tails point inward and the water loving heads point outward. These clusters only form once two conditions are met.

Step 2: The two conditions.
Micelles need a high enough concentration (the critical micelle concentration) and a high enough temperature. Below that temperature the surfactant just stays as plain dissolved molecules or crystals.

Step 3: Name the temperature.
The lowest temperature at which the surfactant becomes soluble enough to gather into micelles is called the Krafft temperature.

Step 4: Rule out the others.
Boyle temperature is about real gases behaving ideally. Critical temperature is the limit above which a gas cannot be liquefied. Inversion temperature relates to the Joule Thomson cooling effect. None of these deal with micelles.

Step 5: Conclusion.
So the answer is Krafft temperature. \[ \boxed{\text{Krafft temperature}} \]