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JEE Main 202528 JanuaryMorning Shift
Exam
JEE Main
Year
2025
Date
28 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Structure of Atom

JEE Main 2025 · 28 January · Morning Shift · Chemistry · Structure of Atom

In a multielectron atom, which of the following orbitals described...

In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? A. n=1,l=0, m1=0\mathrm{n}=1, \mathrm{l}=0, \mathrm{~m}_1=0 B. n=2,l=0, m1=0\mathrm{n}=2, \mathrm{l}=0, \mathrm{~m}_1=0 C. n=2,l=1, m1=1\mathrm{n}=2, \mathrm{l}=1, \mathrm{~m}_1=1 D. n=3,l=2, m1=1\mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_1=1 E. n=3,l=2, m1=0\mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_1=0 Choose the correct answer from the options given below:

Options

  1. AB and C Only
  2. BA and B Only
  3. CC and D Only
  4. DD and E Only

Correct answer

D. D and E Only

Step-by-step solution

A:n=1,ℓ=0, mℓ=01 sB:n=2,ℓ=0, mℓ=02 sC:n=3,ℓ=1, mℓ=13pD:n=3,ℓ=2, mℓ=13 dE:n=3,ℓ=2, mℓ=03 d\begin{array}{lc} \mathrm{A}: \mathrm{n}=1, \ell=0, \mathrm{~m}_{\ell}=0 & 1 \mathrm{~s} \\ \mathrm{B}: \mathrm{n}=2, \ell=0, \mathrm{~m}_{\ell}=0 & 2 \mathrm{~s} \\ \mathrm{C}: \mathrm{n}=3, \ell=1, \mathrm{~m}_{\ell}=1 & 3 \mathrm{p} \\ \mathrm{D}: \mathrm{n}=3, \ell=2, \mathrm{~m}_{\ell}=1 & 3 \mathrm{~d} \\ \mathrm{E}: \mathrm{n}=3, \ell=2, \mathrm{~m}_{\ell}=0 & 3 \mathrm{~d} \\ \end{array} In absence of electric and magnetic fields, all orbitals of 3d are degenerate
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