Question

Which of the following salt has the same value of Van't Hoff factor $i$ as that of $K_{3}\lbrack Fe(CN)_{6}\rbrack$.

• A. $Al_{2}(SO_{4})_{3}$
• B. $NaCl$
• C. $Na_{2}SO_{4}$
• D. $Al(NO_{3})_{3}$

Answer 1

Answer: (A)

$Al_{2}(SO_{4})_{3}$

Answer 2

$K_{4}\lbrack Fe(CN)_{6}\rbrack$ dissociates as $4K^{+} + \lbrack Fe(CN)_{6}\rbrack^{4 -},$ thus 1 molecule dissociates into five particles in the similar way $Al_{2}(SO_{4})_{3}$ also gives five particles per molecule.