Question

The complex [Co(NH₃)₅Br]SO₄ will give white precipitate with ______.

Options

• BaCl₂

• AgNO₃

• KI

• None

Answer 1

The complex [Co(NH₃)₅Br]SO₄ will give white precipitate with `bbunderline(BaCl_2)`.

Explanation:

The complex [Co(NH₃)₅Br]SO₄ contains the sulfate ion \[\ce{(SO^{2-}_4)}\]. When BaCl₂ (barium chloride) is added to the solution, the Ba²⁺ ions react with the sulfate ions to form barium sulfate (BaSO₄), which is insoluble in water and forms a white precipitate. This confirms the presence of the sulfate ion in the complex.