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Introduction to d and f Block Elements

Micelles are ...

Question

Micelles are formed only:

A

below CMC and the Kraft temperature

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B

above the CMC and below the Kraft temperature

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C

above the CMC and above the Kraft temperature

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D

below the CMC and above the Kraft temperature

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Solution

The correct option is C above the CMC and above the Kraft temperature
A micelle may be defines as the cluster or aggregated particles formed by associated collides in solutions. The formation of micelle takes place above certain concentration called Critical Micellization Concentration (CMS) and above a particular temperature called Kraft Temperature $(T_{k})$ . Every micelle system has a specific value of CMC.

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Q. Surfactant molecules can cluster together as micelles, which are colliod sized cluster of molecules. Micelles form only above critical micelle concentration (CMC) and above certain temperature called Kraft temperature.

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Q. Surfactant molecules can cluster together as micelles, which are colliod sized cluster of molecules. Micelles form only above critical micelle concentration (CMC) and above certain temperature called Kraft temperature.

Δ H

of micelle formation can be positive or negative. Which of the following is NOT TRUE about micelle formation?

Q. Assertion :Micelles are formed by surfactant molecules above the critical micellar concentration (CMC). Reason: The conductivity of solution having surfactant molecules decreases sharply at the CMC.

Q. Assertion :Surfactant molecules form micelles above the critical micelle concentration (CMC). Reason: The conductance of solution of surfactant molecules decreases sharply at the (CMC).

Q. Statement-1: Micelles are formed by surfactant molecules above the critical micellar concentration

(C M C)

.
Statement-2: The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

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