\(Na_2O_2\) 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.
Ion having highest hydration enthalpy among the given alkaline earth metal ions is:
A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field \( B \) exists into the page. The bar starts to move from the vertex at time \( t = 0 \) with a constant velocity. If the induced EMF is \( E \propto t^n \), then the value of \( n \) is _____. 