Question

When an excess of AgNO₃ is added to the complex, one mole of AgCl is precipitated. The formula of the complex is ______.

Options

• [CoCl₂(NH₃)₄]Cl

• [CoCl(NH₃)₄]Cl₂

• [CoCl₃(NH₃)₃]

• [Co(NH₃)₆]Cl₃

• [CoCl(NH₃)₅]Cl₂

Answer 1

When an excess of AgNO₃ is added to the complex one mole of AgCl is precipitated. The formula of the complex is [CoCl₂(NH₃)₄]Cl.

Explanation:

Only one mole of AgCl is precipitated, there is one free Cl⁻ ion outside the coordination sphere, which matches [CoCl₂(NH₃)₄]Cl.