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Mg is present in :
A
Chlorophyll
B
Haemoglobin
C
Vitamin $B_{12}$
D
Vitamin B
Detailed Solution
Chlorophyll has a porphyrin ring with a magnesium atom at its centre.
Haemoglobin contains iron, and vitamin $B_{12}$ contains cobalt.
So Mg is present in chlorophyll.
Haemoglobin contains iron, and vitamin $B_{12}$ contains cobalt.
So Mg is present in chlorophyll.