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| Column $I$ (Metals) | Column $II$ (Coordination compounds) |
| $a. Co$ | $i. \text{Wilkinson catalyst}$ |
| $b. Zn$ | $ii. \text{Chlorophyll}$ |
| $c. Rh$ | $iii. \text{Vitamin } B_{12}$ |
| $d. Mg$ | $iv. \text{Carbonic anhydrase}$ |
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