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To an aqueous solution containing ions such as $A l^{+ 3}, Z n^{2 +}, C a^{2 +}, F e^{3 +}, N i^{2 +}, B a^{2 +} a n d C u^{2 +}$ was added conc HCl followed by $H_{2} S$ . The total number of cations precipitated during this reaction are_____

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Detailed Solution

Al⁺³ and Fe⁺³ sulhides hydrolysis in water. Ni⁺² and Zn⁺² require basic medium with H₂S to form ppt Ca⁺² and Ba⁺² sulfides are soluble. Hence, we will receive only CuS ppt.

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