A) Zn (II)
B) Ca (II)
C) Fe (II)
D) Co (III)
Correct Answer: D
Solution :
The molecular formula of vitamin \[{{B}_{12}}\] is \[{{C}_{63}}{{H}_{84}}{{N}_{14}}{{O}_{14}}PCo\] and the chemical name is cyanocobalamine. So, cobalt is present in vitamin \[{{B}_{12}}\].
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