Which of the following is not a complex salt $?$

Which of the following is not a complex salt $?$
  1. $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}ight]$
  2. $\left[\mathrm{Co}\left(\mathrm{NH}_{3}ight)_{6}ight] \mathrm{Cl}_{3}$
  3. $\left(\mathrm{NH}_{4}ight)_{2} \mathrm{SO}_{4}, \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}ight)_{\mathrm{s}} .24 \mathrm{H}_{2} \mathrm{O}$
  4. $\mathrm{K}_{2}\left[\mathrm{Cd}(\mathrm{CN})_{4}ight]$

Solution

$\left(\mathrm{NH}_{4}ight)_{2} \mathrm{SO}_{4} \cdot \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}ight)_{3} \cdot 24 \mathrm{H}_{2} \mathrm{O} ightarrow\left(\mathrm{NH}_{4}ight)_{2} \mathrm{SO}_{4}+\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}ight)_{3}+24 \mathrm{H}_{2} \mathrm{O}$
$2 \mathrm{NH}_{4}^{+}+\mathrm{SO}_{4}^{-}+2 \mathrm{Fe}^{3+}+3 \mathrm{SO}_{4}+24 \mathrm{H}_{2} \mathrm{O}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

Practice more COORDINATION COMPOUNDS questions on Aicharya