Q19 / 90 · JEE Main 2022 (25 Jun Shift 1) · Chemistry

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

  • A
    soap particles remain floating in water as ions.
  • B
    colloidal structure of soap in water is completely disturbed.
  • C
    the hydrophobic part of soap is not able to take away grease.
  • Correct answer
    D
    the micelles are not formed due to concentration of soap, below its CMC value.

Solution

Micelle or associate colloid formation occurs above a certain concentration known as CMC. So, if the concentration of soap is less that means it hasn't reached the CMC value. That is why it does not serve the purpose of cleaning of clothes.

Hence, the correct answer is option: 'D'.

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