1.

Crystal field theory provides correct electronic distribution of central metal under surrounding ligannd field, hence it clearly explains magnetic moment, colour of a complex. Q. Which of the following hydrated complex ion has high intensity colour in aqueous solution.

Answer»

`[Mn(H_(2)O)_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(2+)`
`[Ni(H_(2)O)_(6)]^(2+)`
`[Mn(H_(20O)_(6)]^(2+)`

SOLUTION :In `[Mn(H_(2)O)_(6)]^(3+)`: Both selection rules are followd due to UNSYMMETRICAL filling of `e_(g)` set of orbitals.


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