Match the entries in column - I (industrial process) with that in column - II (catalyst) and select the correct answer.
| Column - I | Column - II |
| P. Contact Process | 1. MnO2 |
| Q. Haber Process | 2. V2O5 |
| R. Decomposition of hydrogen peroxide | 3. TiCl4 |
| S. Ziegler-Natta polymerisation | 4. Fe |
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