Chemical Reaction Engineering
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.

Catalytic homogenous
Catalytic heterogeneous
Non-catalytic homogeneous
Non-catalytic heterogeneous

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Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

Plug flow for dilute liquid requiring no large preheating of feed
High recycle for pure gas
All of these
Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature

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