Periodic Classification and Periodic Properties - Result Question 14

####11. Which of the following represents the correct order of increasing first ionisation enthalpy for $Ca, Ba, S$, Se and $Ar$ ?

(a) $Ca<S<Ba<Se<Ar$

(b) S $<$ Se $<Ca<Ba<Ar$

(c) $Ba<Ca<Se<$ S $<Ar$

(d) $Ca<Ba<S<Se<Ar$

(2013 Main)

Show Answer

Answer:

Correct Answer: 11. (b)

Solution:

  1. Ionisation energy increases along a period from left to right and decreases down a group. The position of given elements in the periodic table is as
Group No. 2 $\mathbf{1 6}$ $\mathbf{1 8}$
$Ca$ $S$ $Ar$
$Ba$ $Se$

Thus, the order of increasing $\Delta H _{IE _1}$ is $Ba<Ca<Se<S<Ar$



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक