alleryWhen soap is added to water, the ionic (hydrophilic) end of the soap molecule interacts with
AGrease and oil
BWater
CThe dirt only
DAir molecules only
Answer & Solution
Correct answer: B. Water
1. A soap molecule has a long hydrocarbon tail (hydrophobic) and a −COO⁻Na⁺ head (hydrophilic).
2. In water, tails cluster inward (avoiding water) and heads point outward toward water.
3. This forms a micelle with grease trapped inside the ball.
4. The soap effectively lifts the dirt off cloth into the water.
_Source: syllabus Science, Ch 4 "Carbon and its Compounds", §4.3_
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