Ncert Exercises & Solutions

The correct statements among the following are:

a.	Micelle formation by soap in an aqueous solution is possible at all temperatures
b.	Micelle formation by soap in an aqueous solution occurs above a particular concentration
3.	On dilution of soap solution micelles may revert to individual ions
4.	Soap solution behaves like a normal strong electrolyte at all concentrations

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: Micelle formation by soap in aqueous solution occurs above a particular concentration

Micelle formation: Some substances at low concentrations behave like a normal electrolyte but at higher concentrations exhibit colloidal behavior due to the formation of micelles.

CMG ( Critical Micelle Concentration): The concentration above which it behaves as a micelle known as Critical micelle concentration (CMC).

e.g., soap solution in the aqueous solution above a particular concentration (called

C M C = 10^{- 4} - 10^{3} m o l L^{- 1}

) forms soap micelles.

On dilution, soap solution behaves like a normal electrolyte and after adding excess water intermolecular force of attraction between the soap particles decreases, and soap solution micelles may revert to individual ions.

Hence, option second is the correct answer

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