Which of the following types of valences, according to Werner's theory is also called as primary valence?
Which of the following types of valences, according to Werner's theory is also called as primary valence?
Ionisable valence
Auxiliary valence
Residual valence
Subsidiary valence
Solution
According to Werner's Coordination Theory, the primary valence refers to the oxidation state or charge of the central metal ion, which is satisfied by ions outside the coordination sphere and is ionisable in nature. These valences are associated with the metal's ability to form ionic bonds.
For example, in $[\mathrm{Co}(\mathrm{NH}_3)_6] \mathrm{Cl}_3$, the primary valence of cobalt is +3 , which is satisfied by three chloride ions ( $\mathrm{Cl}-\mathrm{Cl}-$ ) outside the coordination sphere. These ions are ionisable and determine the compound's overall charge.