Q.

The decreasing order of ionization energies of K, Ca and Ba is 

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a

K >Ba> Ca

b

Ca>Ba>K

c

Ba>K>Ca

d

K>Ca>Ba

answer is A.

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Detailed Solution

As we descend, the group size grows and the nuclear charge on the electrons becomes less effective. Ionization potential falls off in the group as a result. Ca therefore has a higher second ionisation potential than Ba.

K has a higher second ionisation potential than Ca because, after losing one electron, it adopts a stable noble gas structure.

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