The mismatched combinations are A. Chlorophyll – Co B. Water hardness – EDTA C. Photography - Ag ( CN ) 2 - D. Wilkinson catalyst - Ph 3 P 3 RhCl E. Chelating ligand – D - Penicillamine Choose the correct answer from the options given below.

Step-by-step solution

The chlorophyll molecule has a central magnesium atom engulfed by a nitrogen-containing structure called a porphyrin ring; attached to the ring is a long carbon-hydrogen side chain. Hardness of water is determined by titrating with a standard solution of ethylene diamine tetra acetic acid (EDTA) which is a complexing agent. Since EDTA is insoluble in water, the disodium salt of EDTA is taken for this experiment. EDTA can form four or six coordination bonds with a metal ion. Silver bromide is used in photography as