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To an aqueous solution containing ions such as Al 3 + , Zn 2 + , Ca 2 + , Fe 3 + , Ni 2 + , Ba 2 + and Cu 2 + was added conc . HCl , followed by H 2 S . The total number of cations precipitated during this reaction is/are :

Options

  1. A1
  2. B3
  3. C4
  4. D2

Correct answer

A. 1

Step-by-step solution

Al 3 + and Fe 3 + sulphides hydrolyse in water. Ni 2 + and Zn 2 + require basic medium with H 2   S to form precipitate. Ca 2 + and Ba 2 + sulphides are also soluble. only Cu 2 + can form the precipitate with H 2 S in the acidic medium.

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