Platinised asbestos helps in the formation of SO_(3) from SO_(2) and O – InterviewSolution

1.	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.
Answer» CATALYTIC promoter catalytic poison dehyrating agent drying agent . Solution :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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