Question

Which of the following properties don't help in differentiating, different hydrated isomers of $CrCl_{3}.6H_{2}O$ ?

• A. Conductivity measurements
• B. Precipitation by $AgNO_{3}$
• C. Dipole moment
• D. Magnetic moment

Answer 1

Answer: (D)

Different hydrated

$\left(\right.4\left.\right)$ Hydrated isomers of $CrCl_{3}\cdot 6H_{2}O$ are :

$\left(\right.i\left.\right)\left[Cr \left(H_{2} O\right)_{6}\right]\left(Cl\right)_{3}$

$\left(\right.ii\left.\right)\left[Cr \left(H_{2} O\right)_{5} Cl\right]\left(Cl\right)_{2}\cdot H_{2}O$

(iii) $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl} \cdot 2 \mathrm{H}_2 \mathrm{O}$

They all have different conductivity, dipole moment and precipitation by $AgNO_{3}$ , They all have similar magnetic moment because in all complexes, ligands are weak field. $Cr^{+ 3}$ has $3$ unpaired $e-$