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Transition metals usually from coloured ...

Transition metals usually from coloured complexes and d-d transitions `(t_(2g)hArre_(g))` are responsible for colour as the energy difference between `t_(2g)` and `e_(g)` lies in visible region. But all the coloured ions are not dut to d-d transition but charge transfer bands also play important roles. Charge transfer bands may be of two types.
(i) ligand to metal (CTLM)`" "(ii)` metal to ligand (CTML).
Charge transfer transition always produces intense colour as compared to d-d transition.
Select the incorrect statement `:`

A

d- block metal ions are usually coloured

B

Colour of d- block metal ions is generally due to d-d transition

C

All the complexes of Cu^(+)` are colourless on account of diamagnetic nature `(d^(10)` configuration ).

D

`CrO_(3)` is bright orange due to CTLM.

Text Solution

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The correct Answer is:
C
Conceptual
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Knowledge Check

  • Transition metals usually from coloured complexes and d-d transitions (t_(2g)hArre_(g)) are responsible for colour as the energy difference between t_(2g) and e_(g) lies in visible region. But all the coloured ions are not dut to d-d transition but charge transfer bands also play important roles. Charge transfer bands may be of two types. (i) ligand to metal (CTLM) " "(ii) metal to ligand (CTML). Charge transfer transition always produces intense colour as compared to d-d transition. MnO_(4)^(-) is dark purple coloured though Mn is in (+VII) oxidation state with 3d^(@) configuration

    A
    due to d-d transition
    B
    due to CTML spectra
    C
    due to CTLM spectra
    D
    None of these

  • Transition metal ions show colour because

    A
    they absorb light
    B
    they emil light
    C
    they are paramagnetic
    D
    they exhibit d-d transition

  • Transition metal ions show colour because

    A
    they absorb light
    B
    they emil light
    C
    they are paramagnetic
    D
    they exhibit d-d transition

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