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Which of the following element is responsible for oxidation of water to O2 in biological processes? 

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Which of the following element is responsible for oxidation of water to O2 in biological processes? 

(a) Fe

(b) Mn 

(c) Cu 

(d) Mo

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(b) Mn

Water oxidation is catalyzed by a manganese-containing cofactor contained in photosystem II known as the oxygen-evolving complex. Manganese is an important cofactor, and calcium and chloride are also required for the reaction to occur.

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