NEET Chemistry The s-Block Elements Questions Solved


The decreasing order of II ionisation energy of K, Ca, and Ba is –

(A) K > Ca > Ba                                    (B) Ca > Ba > K 

(C) Ba > K > Ca                                   (D) K > Ba > Ca

(A). K+ ion has stable noble gas configuration, so its IE2 is highest. Because IE decreases in the group IE2 of Ca > IE2 of Ba.

Difficulty Level:

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