Question

A substance is completely trimerised on dissolution in a solvent. The van't Hoff's factor (i) for such change is :

• A. $1$
• B. $2$
• C. $3$
• D. $1/3$

Answer 1

The correct option is D $1/3$

The van't Hoff's factor (i) for such change is $1/3$.
van't Hoff factor for association (i) $=1-\alpha +\frac{\alpha }{n}$
Given, $\alpha =1$ and $n=3$
$i=1-1+1/3$
$=1/3$