Question

Under which condition the van't Hoff factor is greater than one ?

Answer 1

Van't Hoff factor will be more than $1$ for the strong electrolytes, which will dissociates to form more than one ion.

$KCl\rightleftharpoons K^{+}+{Cl}^{-}n=2$

$i=1+\alpha (n-1)=1+\alpha >1$