JEE Main 2016ChemistryClassification of Elements and Periodicity in PropertiesEasyMCQ

JEE Main 2016 — Classification of Elements and Periodicity in Properties Question with Solution

JEE Main 2016 (03 Apr)

Question

Which of the following atoms has the highest first ionization energy?

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Show full solutionCorrect option: B
Correct answer
BSc

Step-by-step explanation

Ionisation energy decreases with increase in the size of atom. Na, K, Rb belongs to alkali metal and down the group ionization energy decreases as size of atom increases down the group.  Among the given elements, Sc being small has the highest ionization energy (Na= 496, K=419; Sc =631 kJ mol-1)

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About this question

This is a previous-year question from JEE Main 2016, covering the Classification of Elements and Periodicity in Properties chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.