Back bonding.
Answer:-
This type of bonding occurs between atoms in a compound in which one atom has lone pair of electron and the other has vacant orbital placed adjacent to each other.
angle of contact.
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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