Oxidation state of ‘Rb’ in  ${\text{RbO}}_{\text{2}}$  is

The given compound ${\text{RbO}}_{\text{2}}$  is a super oxide. We know that the element   ‘Rb’ belongs to IA group.  Therefore the oxidation state of Rb in ${\text{RbO}}_{\text{2}}$ is

+1.