(B) Hemoglobin is a red pigment present in the red blood cells of vertebrates. It is a conjugated protein consisting of a protein called globin and a

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(B) Hemoglobin is a red pigment present in the red blood cells of vertebrates. It is a conjugated protein consisting of a protein called globin and a prosthetic group called heme. The heme group is a complex of $Fe^{2+}$ (ferrous) ion coordinated with a porphyrin ring. Therefore,the correct ion is $Fe^{2+}$.