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Density and Anomalous Expansion of Water

When we add s...

Question

When we add soap to water, the surface tension of water _____.

A

Increases

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B

decreases

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C

increases then decreases

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D

decreases then increases

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Solution

The correct option is B
decreases

Soap decreases the surface tension of water. The attractive forces between the water molecules decreases. Hence it is easier to wash our clothes with soap as the water molecules break apart and trap the dirt in between them.

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