The metal ion present in vitamin B12 is :

1.	The metal ion present in vitamin B₁₂ is :
A.	cobalt
B.	zinc
C.	nickel
D.	iron
Answer» B. zinc

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The metal ion present in vitamin B<sub>12</sub> is :
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The metal ion present in vitamin B12 is :

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The metal ion present in vitamin B₁₂ is :