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Sulphur trioxide has an affinity to what?

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Sulphur trioxide has an affinity to what?

(a) Heat

(b) Water

(c) Alcohol

(d) None of the mentioned

The question was asked in an interview for job.

I'm obligated to ask this question of Sulfonates and Sulfates Agents in chapter Sulfonation and Sulfation of Unit Processes

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The correct answer is (b) Water

Explanation: Sulphur trioxide has a very strong affinity for water. So high is this degree of affinity, and so great is the evolution of heat in mixing the two materials, that water in its relation to SO3 may be regarded as a basic substance.

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