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The complex [Co(H2O)6]^3+ absorbs the wavelength of light corresponding to orange colour. Predict the colour of the coordination compound based on this information.

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The complex [Co(H2O)6]^3+ absorbs the wavelength of light corresponding to orange colour. Predict the colour of the coordination compound based on this information.

(a) Red

(b) Yellow

(c) Blue

(d) Colourless

This question was posed to me by my school principal while I was bunking the class.

The question is from Bonding in Coordination Compounds in chapter Coordination Compounds of Chemistry – Class 12

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Correct option is (c) Blue

Easy explanation: This is because of the concept of complementary colours. The colour of the complex is complementary to that which is absorbed and is generated from the wavelength that is left over.

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