JEE Main 2014ChemistryStructure of AtomMediumMCQ

JEE Main 2014 — Structure of Atom Question with Solution

JEE Main 2014 (09 Apr Online)

Question

The energy of an electron in first Bohr's orbit of H atom is −13.6 eV. The energy value of electron in the first excited state of Li 2+ is :

Choose an option

Show full solutionCorrect option: B
Correct answer
B −30.6 eV

Step-by-step explanation

For H atom & H like species
The electronic energy in the nth orbit is

E n = - 13.6 z 2 n 2 eV

E n Li 2 + = - 13.6 × 9 n 2 eV = - 122.4 eV n 2

If n = 2

E 2 Li 2 + = - 122.4 2 2 = - 30.6 eV

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About this question

This is a previous-year question from JEE Main 2014, covering the Structure of Atom 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.