MCQ
Vitamin ${B_{12}}$ contains metal
- A$Ca\, (II)$
- B$Zn \,(II)$
- C$Fe\, (II)$
- ✓$Co \,(III)$
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image $\xrightarrow{{[O]}}A\xrightarrow{{SOC{l_2}}}B\xrightarrow{{Na{N_3}}}C\xrightarrow{{{\text{Heat}}}}D$