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Which is the following compounds absorbs at shorter wavelength in visible spectrum?

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By Expert Faculty of Sri Chaitanya
a
CrBr3H2O3.3H2O
b
CrBr2H2O4Br⋅2H2O
c
CrBrH2O5Br2⋅H2O
d
CrH2O6Br3

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detailed solution

Correct option is D

Shorter wavelength means higher splitting energy. Splitting energy ∝Δobs∝1lobs(4) Has six H2O ligands, and thus H2O has more splitting energy than Br⊖, therefore (4) absorbs at shorter wavelength.


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