Question
Which one of the following is essential for photolysis of water
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Manganese
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Zinc
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Copper
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Boron
Solution
A.
Manganese
Photolysis of water requires light energy and oxygen evolving complex (OEC) and an electron carrier Yz. OEC complex was formerly called Z - enzyme. It has four Mn ions. Light energy brings about changes in Mn (Mn+2, Mn3+ Mn+4) which helps in removing electrons from OH- component of water forming oxygen.Liberation of oxygen also requires Cl- and Ca2+.
