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Platinised asbestos helps in the formati...

Platinised asbestos helps in the formation of `SO_(3)` from `SO_(2)` and `O_(2)`. But, if even a small amount of `As_(2)O_(3)` is present the platinised asbestos does not help in the formation of `SO_(3), As_(2)O_(3)` acts here as `a//an`.

A

positive catalyst

B

negative catalyst

C

autocatalyst

D

poison

Text Solution

Verified by Experts

The correct Answer is:
D
`2SO_(2)+O_(2) underset(As_(2)S_(3)("Poison"))overset("Platinised asbestos(catalyst)")(rarr)2SO_(3)`
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