Which cation forms a colorless aqueous solution? (A) Co2+ (B) Ni2+ (C) Cu2+ (D) Zn2+?

Which cation forms a colorless aqueous solution?

(A) Co2+ (B) Ni2+ (C) Cu2+ (D) Zn2+

please explain

1 Answer

  • The Zn2+ ion has all the d electrons paired since it has an electron

    configuration of [Ar]3d10. All of the other ions have unpaired d electrons which can absorb energy in the visible region and be promoted to a higher energy state.

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