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[Cr(OH2)6]3+ is a pink complex. Recall your [Cr(ox)3]3- complex was a dark green color. Compare the...

[Cr(OH2)6]3+ is a pink complex. Recall your [Cr(ox)3]3- complex was a dark green color. Compare the size Δo in each complex. Are the colors of the complexes consistent with their chemical formulas? Explain your reasoning.

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Answer #1

The oxidation state of Cr in both [Cr(OH2)6]^3+ and [Cr(ox)3]^3- is +3.

Hence in both of the complexes, the central metal atom(Cr3+) has 3 unpaired electrons. Hence both complexes are colored.

Also both have same value of crystal field splitting energy (0) value of - 1.20 as calculated below

Hence the colors of the complexes consistent with their chemical formulas.

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