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  4. The metal present in Vitamin B12 is :

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Q. The metal present in Vitamin $B_{12}$ is :

Delhi UMET/DPMTDelhi UMET/DPMT 2002

Solution:

(i) Cobalt: It is present in vitamin $B_{12}$.
The cobalt atom is coordinated to 4 nitrogen atom.
(ii) Magnesium: It is found in chlorophyll.
(iii) Iron: It is found in haemoglobin.