Haemoglobin, chlorophyll & $B_{12}$ complexes contain the following metal ions

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$F e, M g, C r$

$F e, M g, C o$

$C o, F e, M g$

$M g, C o, F e$

answer is B.

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Detailed Solution

Magnesium metal present in chlorophyll absorbs light energy during the photosynthesis process. Thus, chlorophyll contains Mg. So, haemoglobin and chlorophyll contain Fe, Mg respectively.

Vitamin B₁₂ is also referred to as cobalamin, because it contains a metal ion cobalt.

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