What is surface energy ?

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Answer:-
Potential energy per unit area of the surface of fluid is called surface energy.

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angle of contact.

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It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact  The value of angle of contact depends upon  (i) Nature of solid and liquid in contact  (ii) Cleanliness of the surface in contact  (iii) Medium above the free surface of liquid 
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Difference between electrochemical & electrolytic cell

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what do we mean by electrophoresis & electroosmosis?

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