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(a) Explain the structure of dichromate ...

(a) Explain the structure of dichromate ion.
(b) Why are cadmium salt white ?

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(a)N/A
(b) `Cd^(2+)` ion has `[Kr]^(36)4d^(10)` configuration which means that all the 4d robitals are paired and there is o d-d transition. Therefore, these salts are white.
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