(i) What type of isomerism is shown by the complex `[Cr(H_(2)O)_(6)]Cl_(3)`?
(ii) On the basis of crystal field theory, write the electronic configuration for `d^(4)` ion if `Delta_(0)gtP.`
(iii) Write the hybridization and shape of `[CoF_(6)]^(3-)`. (Atomic number of Co=27)

Explanation

(i) Solvate Isomerism.
(ii) `[Cr(H_(2)O)_(6)]Cl_(3)` Violet
`[Cr(H_(2)O)_(5)Cl]Cl_(2)-H_(2)O` (Blue green)
`[Cr(H_(2)O)_(4)Cl_(2)]Cl. 2H_(2)O` Dark green
(iii) `[CoF_(6)]^(3-)` is an outer orbital or high spin complex involving `Sp^(3)d^(2)` hybridisation and octahedrol shape.