Which one of the following is essential for photolysis of water?

Step-by-step solution

Photolysis of water requires light energy, and oxygen evolving complex (OEC) and an electron carrier Y_z . OEC complex was formerly called Z-enzyme. It has four Mn ions. Light energy brings about changes in Mn ( Mn ⁺², Mn ⁺³, Mn ⁺⁴ ) which helps in removing electrons from OH ⁻ component of water forming oxygen. Liberation of oxygen also requires Cl ⁻ and Ca ²⁺ .