If in a solvent, n simple molecules of solute combine of form an associated molecule, `alpha` is the degree of association, then Van't Hoff factor is equal to

Options

A. `(1)/(1- n alpha)`
B. `(1-alpha + n alpha)/(1)`
C. `(1-alpha+ alpha//n)/(1)`
D. `(alpha/n - 1+ alpha)/(1)`

Answer

C

Explanation

`{:(" nX",hArr," X"_(n)),(1-alpha,,alpha//5):}`
Total moles after association `=1-alpha+ alpha//n`
Van.t Hoff factor, `i=(1-alpha+alpha//n)/(1)`