Which one of the following salts will have the same value of van’t Hoff factor $$(i)$$ as that of $${K_4}\left[ {Fe{{\left( {CN} \right)}_6}} \right]?$$
A.
$$A{l_2}{\left( {S{O_4}} \right)_3}$$
B.
$$NaCl$$
C.
$$Al{\left( {N{O_3}} \right)_3}$$
D.
$$N{a_2}S{O_4}$$
Answer :
$$A{l_2}{\left( {S{O_4}} \right)_3}$$
Solution :
Both $${K_4}\left[ {Fe{{\left( {CN} \right)}_6}} \right]$$ and $$A{l_2}{\left( {S{O_4}} \right)_3}$$ gives 5 ions after dissociation, so they have same value of van't Hoff factor $$(i).$$
$$\eqalign{
& {K_4}\left[ {Fe{{\left( {CN} \right)}_6}} \right] \to 4{K^ + } + {\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{4 - }} \cr
& A{l_2}{\left( {S{O_4}} \right)_3} \to 2A{l^{3 + }} + 3SO_4^{2 - } \cr} $$
Releted MCQ Question on Physical Chemistry >> Solutions
Releted Question 1
An azeotropic solution of two liquids has boiling point lower than either of them when it