Define : (a) Molecular range (b) Sphere of influence.

Define : (a) Molecular range (b) Sphere of influence. 
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Answer :

Molecular range: The maximum distance upto which cohesive force can act is called as molecular range. 

Sphere of influence: The imaginary sphere, surrounding a molecule in which force of attraction is present is called the sphere of influence of that molecule. 

OR 

The imaginary sphere drawn with molecule as a center and molecular range as a radius is called as sphere of influence. 
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