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What happens to the stability of hydrates of SO3, with increase in temperature?

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What happens to the stability of hydrates of SO3, with increase in temperature?

(a) Decreases

(b) Increases

(c) Does not affect

(d) None of the mentioned

This question was addressed to me in an internship interview.

This question is from Sulfonates and Sulfates Agents topic in division Sulfonation and Sulfation of Unit Processes

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Right choice is (a) Decreases

Easy explanation: The hydrates of SO3 exist at low temperatures as definite crystalline compounds, with rising temperature they become increasingly less stable and finally decompose with the disengagement of either SO3 or water.

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