Which statement is consistent with the observation that an aqueous solution of [

Question

Which statement is consistent with the observation that an aqueous solution of [Co(H2O)6]2+ appears violet?

A) The energy separation of the ground and excited states in the cobalt complex is essentially equal to the energy associated with the absorbed yellow light.

B) The energy of the light absorbed by the cobalt complex ion is greater than the energy of the light transmitted by the complex.

C) The energy separation of the ground and excited states in the cobalt complex is greater than the energy separation in a complex that appears orange.

D) The energy separation of the ground and excited states in the cobalt complex is essentially equal to the energy associated with the transmitted violet light.

Explanation / Answer

A. The energy separation of the ground and excited states in the cobalt complex is essentially equal to the energy associated with the absorbed yellow light. The transmitted violet light is the complementary color of the absorbed yellow light

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