why is ionisation enthalpy of hydrogen higher than that of sodium? refer exemplar problem

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Q. The first ionisation enthalpy of magnesium is higher than that of sodium. On the other hand, the second ionisation enthalpy of sodium is very much higher than that of magnesium. Explain.

How would you explain the fact that the first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium?

Q. The first ionisation enthalpies of the alkaline earth metals are higher than that of alkali metals but second ionisation enthalpies are smaller, why?

Q. Assertion :For an element, second ionisation enthalpy will be higher than the first ionisation enthalpy. Reason: Second ionisation enthalpy is sum of energies required to remove two electrons.

Q. First ionisation energy of Cu is higher than that of sodium .If true enter 1 else 0.

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