JEE Main 2022 · 25 Jun · Shift 1 · Chemistry Q79

← JEE Main 2022 · 25 Jun · Shift 1

ChemistrySingle correct+4 / -1Question 79 of 90

Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because :

soap particles remain floating in water as ions.

the hydrophobic part of soap is not able to take away grease.

the micelles are not formed due to concentration of soap, below its CMC value.

colloidal structure of soap in water is completely disturbed.

Answer and worked solution

Official answer: C

Micelles form only above the critical micelle concentration. Too little soap stays below the CMC, no micelles trap the grease, and the clothes are not cleaned.

(C)

Topics:Soaps and detergents Colloids

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JEE Main 2022 · 25 Jun · Shift 1, Chemistry question 79