If the degree of association is `70%` for the reaction `2A hArr (A) _(2)` the van't Hoff factor for the solute A is

Options

A. `0.30`
B. `0.70`
C. `0.35`
D. `0.65`

Answer

D

Explanation

`2A hArr (A) _(2)`
van't-Hoff factor (i)
`70%=0.7` per unit, i.e.
`alpha =0.70 ` (Given),
where,` alpha =` degree of association
n = number of units undergo for association
`I = (1- alpha) + (alpha )/(n)implies (1- 0.70) +(0.70)/(2)`
`i = 0.30 + 0.35 implies 0.65`