| List-$I$ | List-$II$ |
|---|---|
| $(a)$ क्लोरोफिल | $(i)$ रूथेनियम |
| $(b)$ विटामिन-$B_{12}$ | $(ii)$ प्लेटिनम |
| $(c)$ कैंसर-रोधी दवा | $(iii)$ कोबाल्ट |
| $(d)$ ग्रब्स उत्प्रेरक | $(iv)$ मैग्नीशियम |
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