What is the correct order of stability for the superoxides?

Give the number of electrons in the species $H_{2}^{+}$,$H_{2}$,and $O_{2}^{+}$.

If a wire of length $L$ forms a loop of radius $R$ and has $n$ turns,find the magnetic field at the centre of the loop if the current flowing in the loop is $I$.

An achromatic combination of lenses produces

The sum of the magnitudes of two forces acting at a point is $16 ~N$. If their resultant is normal to the smaller force and has a magnitude of $8 ~N$,then the forces are:

For which one of the following elements,the $M^{3+} \mid M^{2+}$ standard electrode potential is more positive?