NEET UG CHEMISTRY MCQ: S-BLOCK ELEMENTS

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Analyzing +4 | -1

The decreasing order of second ionization energy of K, Ca and Ba is:

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Correct option: C

\mathrm{K} > Ca > Ba

Option C (K > Ca > Ba) is correct because after the first ionization, K+ has a noble gas configuration, requiring much more energy to remove the second electron.

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