JEE Main 2019ChemistryStructure of AtomHardMCQ

JEE Main 2019 — Structure of Atom Question with Solution

JEE Main 2019 (09 Apr Shift 1)

Question

For any given series of spectral lines of atomic hydrogen, let  Δv-=v-max-v-min  be the difference in maximum and minimum wave number in cm-1. 

The ratio Δv-Lyman/Δv-Balmar is

Choose an option

Show full solutionCorrect option: D
Correct answer
D9:4

Step-by-step explanation

=vmax-vminlymanvmax-vminBalmar  

∵ν=1λ=Ech


=Emax-EminlymanEmax-EminBalmar 

E=hν, ν=Eh


=E1→∞- E1→2E2→∞- E2→3 


=13.6 11-1∞-13.6 11-1413.6 14-1∞-13.6 14-19


=1-0-1+1414-0-14+19 =1/41/9=94 

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About this question

This is a previous-year question from JEE Main 2019, 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.