Some statements are given. Among them the
correct statements are
a) IP₂ of sodium is greater than that of
Magnesium
b) IP₂ of lithium is greater than IP₁ of Helium
c) IP₂ of sodium is greater than IP₁ of Neon
d) IP₁ of oxygen is greater than that of
Nitrogen

 We know that when sodium loses one e^- it gets Neon configuration which is a stable gas and it is difficult to remove an e^- from Neon that is why  ${\mathrm{IP}}_2$ is very much higher.

But for magnesium to gain a nearest stable configuration it has to lose two electrons than  ${\mathrm{IP}}_3$ value is higher.

Hence Statement 1 is correct.

And Statement 3 is also correct.

Similarly, when Li loses one e^- it gets He configuration which is a stable gas and it is difficult to remove an e^- from He that is why  ${\mathrm{IP}}_2$ is very much higher.

Hence, Statement 2 is also correct.

Now, We know that N has a more stable configuration than O and high ionization enthalpy is required to remove an e^- from a stable configuration.

Therefore, Statement 4 is incorrect.

Hence, option(b) is the answer.