Periodic Classification and Periodic Properties - Result Question 18

####15. The incorrect statement among the following. (1997(C), 1M)

(a) The first ionisation potential of $Al$ is less than the first ionisation potential of $Mg$

(b) The second ionisation potential of $Mg$ is greater than the second ionisation potential of $Na$

(c) The first ionisation potential of $Na$ is less than the first ionisation potential of $Mg$

(d) The third ionisation potential of $Mg$ is greater than third ionisation potential of $Na$

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Answer:

Correct Answer: 15. (b)

Solution:

  1. (a) Correct statement In a period, element of 2nd group has higher first ionisation potential than element of group 13.

(b) Incorrect statement $Mg^{+}$require less energy for further ionisation than $Na^{+}$because of noble gas configuration of $Na^{+}$.

(c) Correct statement Ionisation energy increases from left to right in a period.



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