The metal ion present in Vitamin B12 is
A). Nickel
B). Cobalt
C). Iron
D). Zinc
Cobalt
The structure of B12 is based on a corrin ring, which is similar to the porphyrin ring found in heme, chlorophyll, and cytochrome. It contains the biochemically rare element cobalt sitting in the center of the ring. Also called cobalamin, it is a water-soluble vitamin.
1. The common name of lead (II) sulphide is
2. White phosphorus is always kept under
3. Bleaching powder is used in drinking water as a/an
4. Solder metal is an alloy of
5. Question 5.24:Give four uses of emulsions.
6. Which of the following is used to remove ink and rust stains on cloth?