Question

Which of the following will have same value of van't Hoff factor as that of $K_4\left[Fe{\left(CN\right)}_6\right]$?

• A. ${Al}_2{\left({SO}_4\right)}_3$
• B. $Al{Cl}_3$
• C. $Al{\left({NO}_3\right)}_3$
• D. $Al{\left(OH\right)}_3$

Answer 1

The correct option is A ${Al}_2{\left({SO}_4\right)}_3$

$i$ for $K_4\left[{Fe\left(CN\right)}_6\right]=5$

$K_4\left[Fe{\left(CN\right)}_6\right]⟶\underset{}{{4K}^{+}+{\left[Fe{\left(CN\right)}_6\right]}^{-4}}$

$n=5$

Since $i=n$ for strong electrolytes so $i=5$

${Al}_2{\left({SO}_4\right)}_3\Rightarrow i=5$

${Al}_2{\left({SO}_4\right)}_3⟶\underset{}{{2Al}^{3+}+3{SO}_4^{2-}}$

$n=5$

So $i=n=5$