JEE Main 2022ChemistryStructure of AtomMediumNumerical

JEE Main 2022 — Structure of Atom Question with Solution

JEE Main 2022 (25 Jun Shift 1)

Question

The longest wavelength of light that can be used for the ionisation of lithium ion is x×10-8 m. The value of x is (Nearest Integer)

(Given : Energy of the electron in the first shell of the hydrogen atom is -2.2×10-18 J; h=6.63×10-34Js and c=3×108 ms-1)

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Show full solutionCorrect answer: 4
Correct answer
4

Step-by-step explanation

Electronic configuration of Li=1s22s1

ELin=2=EHZ2n2=-2.2×10-18×94

6.63×10-34×3×108λ=2.2×10-18×94

λ=4×10-8 m

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About this question

This is a previous-year question from JEE Main 2022, 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.