(A) : Kerosene Oil spreads out over water surface
(R) : Surface tension is a surface phenomenon

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'A' is true and 'R' is false

Both 'A' and 'R' are true and 'R' is not the correct explanation of ''A'

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'

'A' is false and 'R' is true

answer is B.

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Detailed Solution

The force of adhesion between the molecules of oil and water is greater than the force of cohesion of oil molecules. Oil therefore covers the water's surface.

A surface contracts and has less surface area due to surface tension. When a liquid comes into contact, this phenomena happens as it attempts to occupy as little surface area as possible. The molecular theory of matter can be used to explain the phenomenon of surface tension.

Hence, both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'.

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