\(Na_2O_2\) is not the superoxide of sodium. It is peroxide of sodium.
The correct superoxide formula for sodium is \(NaO_2\).
So, the correct option is (D): It is the super oxide of sodium.
Identify A in the following reaction. 
In which form does \(BeCl_{2}\) exist in the solid state, vapor state and high temperature?
(1) Polymeric, Dimeric, Monomeric
(2) Dimeric, Polymeric, Monomeric
(3) Monomeric, Dimeric, Polymeric
(4) Polymeric, Monomeric, Dimeric
Ion having highest hydration enthalpy among the given alkaline earth metal ions is:
Identify A in the following reaction. 