Question

Which does not give a precipitate with $AgNO_{3}$ solution?

• A. $\left[ Co \left( NH _{3}\right)_{6}\right] Cl _{3}$
• B. $\left[ Co \left( NH _{3}\right)_{5} Cl \right] Cl _{2}$
• C. $\left[ Co \left( NH _{3}\right)_{4} Cl _{2}\right] Cl$
• D. $\left[ Co \left( NH _{3}\right)_{3} Cl _{3}\right]$

Answer 1

Answer: (D)

$\left[ Co \left( NH _{3}\right)_{3} Cl _{3}\right]$

Answer 2

$\left[ Co \left( NH _{3}\right)_{3} Cl _{3}\right]$ does not give a precipitate with $AgNO _{3}$ solution because in it all the chlorine atoms are attached by secondary valencies.