Identify the ion that is responsible for the blue of turquoise. A) Cr²⁺ B) Cu⁺ C) Cu²⁺ D) Cr³⁺ E) Fe²⁺

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Quizplus · Accepted Answer

The ion responsible for the blue of turquoise is typically copper(II) ion, which has a coordination number of 4 or 6. In choice C, Cu is the symbol for copper and it has a charge of +2, which matches with the charge of the sulfate ion (SO4) that is also present. Therefore, CuSO4 is a common compound associated with the blue color of copper-containing minerals like turquoise.

Identify the Ion That Is Responsible for the Blue of Turquoise