Question

If the secondary valency in $CoC{l}_3.4N{H}_3$ is six, the solution conductivity in silver nitrate corresponds to ______ electrolyte.

• A. 1:1
• B. 1:2
• C. 1:3
• D. 1:4

Answer 1

The correct option is A 1:1

Werner observed that 'X' mol of $AgCl$ was precipated per mole of $CoC{l}_3.4N{H}_3$ with excess silver nitrate.
There are seven groups attached to the cobalt atom. As the secondary valence of the metal ion in the complex is six, four ammonia and two of the Cl form the coordination polyhedra, leaving only one chloride to be precipitated as $AgCl.$ therefore the ratio of $CoC{l}_3.4N{H}_3:AgCl$ is 1:1
Hence, option (a) is the correct answer.