Q.

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

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a

CrBr3H2O3.3H2O

b

CrBr2H2O4Br⋅2H2O

c

CrBrH2O5Br2⋅H2O

d

CrH2O6Br3

answer is D.

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Detailed Solution

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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