Q.

Platinised asbestos helps in the formation of SO3 from SO2 and O2. But, if even a small amount of As2O3 is present the platinised asbestos does not help in the formation of SO3.  As2O3 acts here as a/an

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a

positive catalyst

b

negative catalyst

c

autocatalyst

d

poison

answer is D.

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Detailed Solution

2SO2+O2→As2O3(Poison)Platinised absestos(catalyst)2SO3
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Platinised asbestos helps in the formation of SO3 from SO2 and O2. But, if even a small amount of As2O3 is present the platinised asbestos does not help in the formation of SO3.  As2O3 acts here as a/an