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Question

The incorrect statement among the following:

A
The first ionisation potential of Al is less than the first ionisation potential of Mg.
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B
The second ionisation potential of Mg is greater than the second ionisation potential of Na.
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C
The first ionisation potential of Na is less than the first ionisation potential of Mg.
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D
The third ionisation potential of Mg is greater than third ionisation potential of Na.
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Solution

The correct option is B The second ionisation potential of Mg is greater than the second ionisation potential of Na.
Option (a): Given statement is correct. In a period, the element of the 2nd group has higher first ionisation potential than the element of group 13.
Option (b): Given statement is incorrect. Mg+ ion requires less energy for further ionisation than Na+ ion because of the noble gas configuration of Na+ ion.
Option (c): Given statement is correct. Ionisation energy increases from left to right in a period.
Option (d): Given statement is correct. Mg2+ ion has a noble gas configuration hence it will be having greater ionisation energy than Na2+ ion.


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