3. Which of the following transition metals is a component of vitamin B₁₂?(A)Co(B)Zn(C)Fe(D)Au(E)Cu

1. Which breakthrough was awarded the Nobel Prize in Chemistry in 2023?(A)Development of ultra-high-resolution electron microscopy for biological systems(B)Discovery and synthesis of quantum dots(C)Discovery of a new class of antibiotics targeting antibiotic-resistant bacteria(D)Advancements in computational chemistry for drug discovery(E)Creation of sustainable and efficient hydrogen production methods

3. Which of the following transition metals is a component of vitamin B₁₂?
(A)Co
(B)Zn
(C)Fe
(D)Au

(E)Cu

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