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A small drop of oil spreads over water because :
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- oil has a higher surface tension
- water has a higher surface tension
- oil has a higher viscosity
- water has a higher viscosity
- oil has a higher surface tension
Correct Option: B
Surface tension of oil is smaller than that of water. When oil is dropped on the surface of water, the force stretches the oil drops on all sides. Hence the oil spreads over the surface of water.
