Question

3. Why the impurity of arsenic oxide must be removed before
passing the mixture of So, and air through the catalytic
chamber?​

Answer 1

Answer:

Impurity of ARSENIC poisons the catalyst [i.e. deactivates the catalyst]. So, it must be removed before passing the mixture of SO2 air through the catalytic chamber.

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Answer 2

Answer:

because the impurities of arsenic poisons are the catalyst.