A water drop takes the shape of a sphere in o | vedclass

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Question

(A) The shape of a liquid drop is determined by the competition between cohesive forces $(C.F.)$ and adhesive forces $(A.F.)$.When a water drop is pla

Vedclass · Accepted Answer

$C.F.$ for water  >  $A.F.$ for water and oil

Vedclass · Answer

(A) The shape of a liquid drop is determined by the competition between cohesive forces $(C.F.)$ and adhesive forces $(A.F.)$.When a water drop is placed in oil, it forms a sphere because the cohesive forces between water molecules are stronger than the adhesive forces between water and oil molecules $(C.F._{water} > A.F._{water-oil})$.Conversely, when an oil drop is placed in water, it spreads because the adhesive forces between oil and water molecules are stronger than the cohesive forces between oil molecules $(A.F._{water-oil} > C.F._{oil})$.Therefore, the primary reason for the water drop remaining spherical in oil is that the cohesive force of water is greater than the adhesive force between water and oil.

Column-$I$	Column-$II$
$(a)$ Cohesive force	$(i)$ Useful for writing by chalk on blackboard.
$(b)$ Adhesive force	$(ii)$ Useful in soldering.
	$(iii)$ Useful for formation of spherical drops of liquid.

$A$ water drop takes the shape of a sphere in oil, while an oil drop spreads in water, because ($A.F.$ = adhesive force, $C.F.$ = cohesive force)

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Force in Column-$I$ and its use in Column-$II$ are given. Match them appropriately.
Column-$I$ Column-$II$
$(a)$ Cohesive force $(i)$ Useful for writing by chalk on blackboard.
$(b)$ Adhesive force $(ii)$ Useful in soldering.
$(iii)$ Useful for formation of spherical drops of liquid.

What is the maximum distance up to which the molecules can exert an attractive force on each other?

Define the surface of a liquid.

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