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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

catalytic promoter

B

catalytic poison

C

dehyrating agent

D

drying agent .

Text Solution

Verified by Experts

The correct Answer is:
B
The presence of traces of `As_(2)O_(3)` in the reacting gases reduces the activity of plantinised asbestos which is used as catalyst in contact process.
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