Explain Werner's theory. Give the Werner's structures of `CoCl_3. 6NH_3 , CoCl_3 . 5NH_3, CoCl_3 . 4NH_3` and `CoCl_3 . 3NH_3` .

Arrange the complexes CoCl_3. 6NH_3, CoCl_3. 5NH_3, CoCl_3. 4NH_3 and CoCl_2 . 3NH_3 in the descending order of conductivity of their aqueous solutions.

The correct order of the stiochiometers of AgCl formed when AgNO_3 in excess is treated with the complexes. CoCl_3. 6NH_3, CoCl_3. 5NH_3, CoCl. 4NH_3 respectively is :

Number of dative bonds in the complex CoCl_(3).5NH_(3) is

Number of dative bonds in the complex CoCl_(3).5NH_(3) is

Number of chlorides satisfying secondary valency in CoCl_3 . 4NH_3