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  9. Q3

PPSC PCS 2015 · Question 3 of 100

Cleansing action of soap occurs because

Science & Tech

  1. AOil and grease can be absorbed into the hydrophobic centres of soap micelles and get washed away.Correct
  2. BOil and grease can be absorbed into the hydrophilic centres of soap micelles and washed away.
  3. COil and grease can be absorbed into both hydrophilic and hydrophobic centres but not washed away.
  4. DCleansing action is not related to micelles.

Answer: A. Oil and grease can be absorbed into the hydrophobic centres of soap micelles and get washed away.

Explanation

Soap forms micelles whose hydrophobic tails absorb oil and grease, which are then washed away with water.

Source: https://cdn.mindspritesolutions.com/examrace/SPSC/Punjab-PSC/Punjab-PSC-Past-Papers/Punjab-Civil-Service-2015-Official-Paper-1-Part-1.pdf

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