WAEC Chemistry 2023 Objective — Question 39

Question 39 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

A compound that could be dried by using conc. tetraoxosulphate (VI) acid and not by calcium oxide is likely to be

A. a salt
B. a base
C. an alkane
D. an acid anhydrideCorrect

Explanation

It is likely to be an acid anhydride (an acidic gas). An acidic gas should not be dried with an alkaline/basic drying agent (like calcium oxide) since they would react — but it can be dried with an acidic drying agent such as concentrated H2SO4. (See the reasoning for Q17.)

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