Chemistry - Coordination Chemistry Question with Solution | TestHub

$\text{Co}$has six coordination number, hence formulae for compounds$\text{A,}\text{B}$and$\text{C}$should be
$\left(\text{A}\right)\left[\text{Co}{\left({\text{NH}}_{\text{3}}\right)}_{\text{6}}\right]{\left(\text{Cl}\right)}_{\text{3}}$
$\left(\text{B}\right)\left[\text{Co}{\left({\text{NH}}_{\text{3}}\right)}_{\text{5}}\text{Cl}\right]{\left(\text{Cl}\right)}_{\text{2}}\left({\text{NH}}_{\text{3}}\right)$
$\left(\text{C}\right)\left[\text{Co}{\left({\text{NH}}_{\text{3}}\right)}_{\text{4}}{\text{Cl}}_{\text{2}}\right]\left(\text{Cl}\right){\left({\text{NH}}_{\text{3}}\right)}_{\text{2}}$
Primary valency is equal to the oxidation state of the central metal ion.