Question

Which one of the following electrolyte has the same value of vant'Hoff factor $\left(\right.i\left.\right)$ as that of $\left(Al\right)_{2}\left(\right.\left(SO\right)_{4}\left(\left.\right)_{3}$ (If $60\%$ ionised) :-

• A. $K_{3}\left[Fe \left(\right. CN \left(\left.\right)_{6}\right]\alpha =1$
• B. $TiCl_{4}\alpha =0.8$
• C. $K_{4}\left[Fe \left(\right. CN \left(\left.\right)_{6}\right]\alpha =0.4$
• D. $Na_{2}KPO_{4}\alpha =0.8$

Answer 1

Answer: (D)

$\left(Al\right)_{2}\left(\right.\left(SO\right)_{4}\left(\left.\right)_{3}i=1-0.6+5\times 0.6=3.4$
$i=1-\alpha +nα$
$\left(\right.A\left.\right)i=4$
$\left(\right.B\left.\right)i=1-0.8+5\times 0.8=4.2$
$\left(\right.C\left.\right)i=1-0.4+5\times 0.4=2.6$
$\left(\right.D\left.\right)i=1-0.8+4\times 0.8=3.4$