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Question

In which of the following ions, the colour is not due to $$d-d$$ transition?


A
[Ti(H2O)6]3+
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B
[Cu(NH3)4]2+
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C
[CoF6]3
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D
CrO24
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Solution

The correct option is D $$CrO_4^{2-}$$
Colour is due to d-d transtition ,then such complexes have colour due to d-d transition are surely octahedral complexes.
Among the given options,                                                   
                                         $${ \left[ Ti{ \left( { H }_{ 2 }O \right)  }_{ 6 } \right]  }^{ 3+ }$$
                                        $${ \left[ Cu{ \left( { NH }_{ 3 } \right)  }_{ 4 } \right]  }^{ 2+ }$$
                                           $${ \left[ { COF }_{ 6 } \right]  }^{ 3- }$$
This are octahedral complexes.
$$CrO_4^{2-}$$ is a salt,it colour is not due to d-d transition.

Chemistry

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