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| स्तंभ-$I$ | स्तंभ-$II$ |
| $A. V_2O_5$ | $i. \text{SO}_2 \text{ का } \text{SO}_3 \text{ में रूपांतरण}$ |
| $B. Ni$ | $ii. \text{तेल का हाइड्रोजनीकरण}$ |
| $C. MnO_2$ | $iii. \text{KClO}_3 \text{ से } \text{O}_2 \text{ का निर्माण}$ |
| $D. Fe$ | $iv. \text{हैबर प्रक्रम}$ |
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