Contact Process: SO3 Not Absorbed in Water

[uzair_ha91]

Homework Statement

SO3 is not absorbed in water directly to form sulfuric acid because
A. Reaction doesn't go to completion
B. Reaction is slow.
C. Highly exothermic.
D. Insoluble

Homework Equations

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The Attempt at a Solution

MY understanding: Because it results in the formation of mist or acid particles in air which does not condense easily.
From this I conclude that the answer is either C or D because the reaction does occur even though we don't get the product in the desired state and formation of mist doesn't seem slow to me...
Can anyone please clarify?

 

[chemisttree]

Direct absorption is kind of dangerous... it being so reactive with water and all.

 

[uzair_ha91]

So formation of that mist which manifests that the reaction is highly reactive means that reaction is exothermic?

 

[chemisttree]

Ooohhyeahhhh.