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In the contact process for industrial ma...

In the contact process for industrial manufacture of sulphuric acid, some amount of sulphuric acid is used a starting material. Explain briefly. What is the catalyst used in the oxidation of `SO_2` ?

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The commonly used catalyst are Pt, `Fe_(2)O_(3)`, and `V_(2)O_(5)`. Since Pt is very costly and poisoned by impurities, `V_(2)O_(5)` is used now a days.
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