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What are catalytic poisons? Give an exam...

What are catalytic poisons? Give an example.

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A substance which destroys the activity of the catalyst is called a poison and the process is called catalytic poisoning. Some of the examples are Eg: The platinum catalyst used in the oxidation of `SO_2` in contact process is poisoned by arsenious oxide.
`2SO_2 + O_2 underset("poisoned by " As_2O_3)overset(pt)(iff) 2SO_3`
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