An aqueous solution contains and . Which of these ions will NOT produce a white precipitate upon the — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Dilute $HCl$ is the group reagent for Group I cations ($Ag^+, Pb^{2+}, Hg_2^{2+}$). They form insoluble white chlorides ($AgCl, PbCl_2, Hg_2Cl_2$). $Cu^{2+}$ belongs to Group II and its chloride ($CuCl_2$) is soluble in water, so it does not precipitate.