Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Molecular Orbital Ligand Field · Exam: NET DEC 2018 · Marks: 2 · Difficulty: Medium
Consider the two sets of molecules. Set A: $\left[\mathrm{AlF}_{6}\right]^{3-},\left[\mathrm{PF}_{6}\right]^{-},\left[\mathrm{SF}_{6}\right]$ and $\left[\mathrm{SiF}_{6}\right]^{2-}$ Set B: $\left[\mathrm{Ba}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+},\left[\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+},\left[\mathrm{Mg}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$, $\left[\mathrm{Sr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ The slowest ligand exchange rate in Set A and Set B are, respectively
(a)$\left[\mathrm{AlF}_{6}\right]^{3-}$ and $\left[\mathrm{Sr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(c)$\left[\mathrm{SiF}_{6}\right]^{2-}$ and $\left[\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(b)$\left[\mathrm{SF}_{6}\right]$ and $\left[\mathrm{Mg}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(d)$\left[\mathrm{PF}_{6}\right]^{-}$ and $\left[\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$