Question

One mole of Co(NH3)5Cl3 gives 3 moles of ions on dissolution in water. One mole of this reacts with two moles of AgNO3 to give two moles of AgCl. The complex is :

• A. [Co(NH3)4Cl2]Cl.NH3
• B. [Co(NH3)4Cl]Cl2.NH3
• C. [Co(NH3)5Cl]Cl2
• D. [Co(NH3)3Cl3].2NH3

Answer 1

Answer: (C)

$Co(NH3)5Cl$Cl2

Answer 2

Only primary valencies out side the coordination sphere are ionised and these react with AgNO3 to give white precipitate of AgCl.