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प्रश्न
Vitamin-B12 is a complex of ______.
रिकाम्या जागा भरा
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उत्तर
Vitamin-B12 is a complex of cobalt.
Explanation:
Vitamin B12 is a complex of cobalt. It contains a central Co3+ (cobalt) ion coordinated to a corrin ring and various ligands, including a cyanide group or methyl group, depending on the form of the vitamin.
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