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JEE Main 2013 Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main 2013

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?

Answer: (1)

Solution

s-block metals (Ba, Ca) have low IE; in a period IE increases left to right; noble gases (Ar) have highest IE. Order: Ba < Ca < Se < S < Ar.

Question ID VK-000891