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Q. The metal ion present in vitamin B12 is:

  • (A) nickel
  • (B) cobalt
  • (C) iron
  • (D) zinc
  • Correct Answer - Option(B)
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Explanation by: Admin

Vitamin B12 (also known as Cobalamin) contains Cobalt (Co) as its central metal ion.

  • The presence of cobalt gives vitamin B12 its characteristic red color.
  • It is essential for red blood cell formation, DNA synthesis, and nervous system function.

Why are the other options incorrect?

  1. Nickel (A) → Found in some enzymes but not in Vitamin B12.
  2. Iron (C) → Essential for hemoglobin but not present in B12.
  3. Zinc (D) → Important for immunity and enzyme function, but not in B12.

Thus, the correct answer is (B) Cobalt.

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