The core metal of chlorophyll is

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(B) The core metal of chlorophyll is $Mg$ (Magnesium).Chlorophyll is a porphyrin derivative with a central magnesium atom coordinated to four nitrogen

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$Mg$

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(B) The core metal of chlorophyll is $Mg$ (Magnesium).Chlorophyll is a porphyrin derivative with a central magnesium atom coordinated to four nitrogen atoms of the porphyrin ring.This central $Mg^{2+}$ ion is essential for the light-harvesting function of chlorophyll molecules during photosynthesis.If the central $Mg$ atom is replaced by $Fe$ (Iron),the molecule is converted into a different pigment,such as those found in cytochromes,which are involved in electron transport rather than light absorption.

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