JEE Main 2019ChemistryStructure of AtomHardMCQ

JEE Main 2019 — Structure of Atom Question with Solution

JEE Main 2019 (09 Jan Shift 2)

Question

Which of the following combination of statements is true regarding the interpretation of the atomic orbitals?

(A) An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the orbital of lower angular momentum.

(B) For a given value of the principal quantum number, the size of the orbit is inversely proportional to the azimuthal quantum number.

(C) According to wave mechanics, the ground state angular momentum is equal to h2π .

(D) The plot of ψ Vs r for various azimuthal quantum numbers, shows peak shifting towards higher r value.

Choose an option

Show full solutionCorrect option: D
Correct answer
D(A), (D)

Step-by-step explanation

Statements (B) and (C) are incorrect.

For a given value of the principal quantum number, the size of the orbit is directly proportional to the azimuthal quantum number and not inversely proportional.
The formula for angular momentum is h2πl(l+1)  
If the electron is in ground state, n will be 1 and the only azimuthal quantum number value can be 0. If l = 0, angular quantum momentum will also be 0. The plot of ψ Vs r for various azimuthal quantum numbers, shows peak shifting towards higher r value.

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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.