Capillary action of the liquid can be explained on the basis of its:

resistance to flow

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surface tension

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heat of vaporisation

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refractive index

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Solution

The correct option is A surface tension
Capillary action of the liquid can be explained on the basis of surface tension. It occurs because of intermolecular forces between liquid and surrounding solid surfaces. IF the diameter of the tube is sufficiently small, then combination of cohesion within the liquid and ahesive forces within the liquid and container wall act to propel the liquid.

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