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Sulphuric acid and oleum are also called ______ of SO3.

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Sulphuric acid and oleum are also called ______ of SO3.

(a) Hydrates

(b) Alcohol

(c) Amines

(d) Oxides

I got this question in an interview for job.

This interesting question is from Physical and Chemical Factors in section Sulfonation and Sulfation of Unit Processes

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Right answer is (a) Hydrates

The best I can explain: the hydrates of SO3 (i.e., sulfuric acid and oleum) are properly regarded as solutions of SO3 in water.

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