Relationship between van't Hoff ' s factor (i) and degree of dissociation `(alpha)` is

Answer

D

Explanation

Relationship between vant Hot factor (i) and degree of dissociation `(alpha)` is given by
` alpha = (1 - i)/(n' - 1)`
Where, n is the number of ions formed after dissociation.
The relationship can be obtained as follows:
For the reaction, `A hArr n'B`
Initially 1 mole 0
Total number of moles present in the solution
`= (1 - alpha) + n' alpha = 1 + (n' - 1) alpha`
Van't Hoff factor,` i = 1 + (n' - 1), alpha gt 1` if ` n ge 2`
`:. alpha = (i - 1)/(n' - 1)`