JAMB Chemistry 2008 Objective — Question 21

Question 21 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2008 Objective paper, with the correct answer and a full explanation.

Insoluble salts can be prepared by

A. titrating an alkali against an appropriate acid
B. reacting an acid with trioxocarbonate (IV) salt
C. direct combination of the elements which make up the salt
D. mixing two soluble compounds containing the metallic radical and the acidic radicalCorrect

Explanation

Insoluble salts are usually prepared by double decomposition. Double decomposition involves two soluble compounds to produce one soluble and an insoluble compound. For instance, AgCl can be prepared by the double decomposition between AgNO3(aq) and NaCl(aq): AgNO3(aq)+NaCl(aq)->AgCl(s)+NaNO3(aq).

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