Which of the following is the correct explanation for why soap molecules can remove grease and oil stains?

hard Q10 of 15

General Science - Physics (Basics)

ASoap molecules are polar and dissolve in water only

BSoap molecules have a non-polar tail that dissolves in oil and a polar head that dissolves in water

CSoap molecules are acidic and react chemically with grease

DSoap molecules evaporate grease on contact

Step-by-Step Solution

Step 1: Understand soap molecular structure
Soap molecules have a dual nature: a hydrophobic (non-polar) tail and a hydrophilic (polar) head.
Step 2: Analyze how soap cleans grease
The non-polar tail dissolves in grease/oil, while the polar head dissolves in water, allowing grease to be emulsified and washed away.
Step 3: Explain why other options are incorrect
Soap molecules are not only polar; they are not acidic and do not chemically react with grease; they do not evaporate grease.
Final Answer:
Soap molecules have a non-polar tail that dissolves in oil and a polar head that dissolves in water → Option B
Quick Check:
Soap cleaning action = Non-polar tail + Polar head ✅

Quick Trick: Soap molecules act as emulsifiers due to dual nature.

Common Mistakes:

Master "Physics (Basics)" in General Science

Start learning the concept with an interactive lesson.

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More General Science Quizzes