The incorrect statement among the following is
The second ionisation potential of Mg is greater than the second ionisation potential of Na
I.E.(II) of Na is higher than that of Mg because in the case of Na the second e− has to be removed from the noble gas configuration while in the case of Mg removal of second e− gives a noble gas configuration.
Mg has higher first ionization potential than Na because of its stable ns2 configuration.