The incorrect statement among the following is : - Vidyadip

MCQ

The incorrect statement among the following is :

A
The first ionisation potential of $\ce{Al}$ is less than the first ionisation potential of $\ce{Mg}$.
✓
The second ionisation potential of $\ce{Mg}$ is greater than the second ionisation potential of $\ce{N}.$
C
The first ionisation potential of $\ce{Na}$ is less than the first ionisation potential of $\ce{Mg}.$
D
The third ionisation of potential of $\ce{Mg}$ is greatest.

✓

Answer

Correct option: B.

The second ionisation potential of $\ce{Mg}$ is greater than the second ionisation potential of $\ce{N}.$

After removal of an electron sodium acquires stable noble gas configuration. It is difficult to remove electron from stable noble gas configuration species.
Therefore, second ionization potential of $\ce{Mg}$ is less than that of $\ce{Na}$.

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