Chemistry - Biomolecules Question with Solution | TestHub

Chlorophyll is a green pigment found in plants, algae, and cyanobacteria, which is essential for photosynthesis.

Structurally, chlorophyll is a coordination complex consisting of a substituted porphyrin ring (specifically a chlorin ring) with a central metal ion.

The central metal ion coordinated in the porphyrin ring of chlorophyll is magnesium, specifically in the $+2$ oxidation state.

Thus, the cation present in chlorophyll is ${\text{Mg}}^{2+}$.

Answer: ${\text{Mg}}^{2+}$