Al3+ and Fe3+ sulphides hydrolyse in water. Ni2+ and Zn2+ require basic medium with H2S to form precipitate. Ca2+ and Ba2+ sulphides are also soluble. only Cu2+ can form the precipitate with H2S in the acidic medium.
To an aqueous solution containing ions such as Al3+,Zn2+,Ca2+,Fe3+,Ni2+,Ba2+ and Cu2+ was added conc.HCl, followed by H2S. The total number of cations precipitated during this reaction is/are :
Held on 27 Jul 2021 · Verified 6 Jul 2026.
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