In the compound CoCl3.5NH3 :

Engineering

Chemistry

Important Term for Coordination Compounds

Werners Theory and Sidwicks EAN Rule

Isomerism in Coordination Compounds

Question

In the compound CoCl₃.5NH₃ :

all the Cl show primary valency only

Two Cl show primary valency and one Cl shows secondary valency

Two Cl show primary valency and one Cl shows primary valency as well as secondary valency

All the Cl show secondary valency

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In the given coordination complex 5 NH₃ 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 [Co(NH₃)₅Cl]Cl₂ that the one Cl is acting as a secondary valency and 2 Cl act as primary valency.Hence option B is correct.