Question

In the compound $CoC{l}_3.5N{H}_3$:

• A. all the $Cl$ show primary valency only
• B. Two $Cl$ show primary valency and one $Cl$ shows secondary valency
• C. Two $Cl$ show primary valency and one $Cl$ shows primary valency as well as secondary valency
• D. All the $Cl$ show secondary valency

Answer 1

The correct option is B Two $Cl$ show primary valency and one $Cl$ shows secondary valency

In the given coordination complex 5 $N{H}_3$ molecule are directly attached to metal whereas only one one Cl is directly attached to metal and rest 2 are satisfying the oxidation state of metal and called as primary valency of the metal.Therefore it can be seen from the image and the formula of the complex which is $\left[Co\right(N{H}_3{)}_{5}Cl]C{l}_2$ that the one Cl is acting as a secondary valency and 2 Cl act as primary valency.Hence option B is correct.