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Which d block elements are biologically important metals?

AFe, Co, Cu, Mo and Zn
BNa, K, Ca and Mg only
CPb, Hg, Cd and As only
DAg, Au, Pt and Pd only
Answer & Solution
Correct answer: A. Fe, Co, Cu, Mo and Zn
Iron, cobalt, copper, molybdenum and zinc act in enzymes and carrier proteins.
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