Consider the following sequence of tests, M^n+ + HCl - white precipitate -- water soluble. The metal ion (M^n+) would be:

Question

Consider the following sequence of tests, M^n+ + HCl -> white precipitate -$\Delta$-> water soluble. The metal ion (M^n+) would be:

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: Adding HCl to a solution containing Group I cations (Ag+, Pb2+, Hg22+) precipitates them as insoluble white chlorides. Step 2: Among these chlorides, lead(II) chloride (PbCl2) dissolves readily in hot water because of its high endothermic dissolution character. Step 3: Therefore, the metal ion is Pb2+, which corresponds to option (c).

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