JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 25 June 2022, Shift 1, Chemistry Q79

Question 79 of 90 in this shift, Chemistry question 19 of 30, Section A.

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

(1)soap particles remain floating in water as ions.
(2)the hydrophobic part of soap is not able to take away grease.
(3)the micelles are not formed due to concentration of soap, below its CMC value.Official answer
(4)colloidal structure of soap in water is completely disturbed.

Official answer

Option 3

NTA final key.

Chapter: Chemistry in Everyday Life
Topic: Colloids
Idea tested: Micelle Formation and CMC

Same idea in other shifts

Asked 5× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.