Vitamin $B_{12}$ contains:

Vitamin $B_{12}$ contains:
  1. $\mathrm{Fe}$ (II)
  2. $\mathrm{Co}$ (III)
  3. $\mathrm{Zn}$ (III)
  4. $\mathrm{Ca}$ (II)

Solution

Vitamin $B_{12}$ is also referred to as cobalamin, because it contains a metal ion Cobalt [Co (III)]. Related Theory The most common cause of vitamin $B_{12}$ deficiency is a lack of asubstance called intrinsic factor due to which immune system mistakenly attacks the stomach cells that produce this substance and cause pernicious anaemia

Asked in: NEET 2003

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