JEE MAIN - Chemistry (2025 - 28th January Morning Shift - No. 8)
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. $\mathrm{n}=1, \mathrm{l}=0, \mathrm{~m}_1=0$
B. $\mathrm{n}=2, \mathrm{l}=0, \mathrm{~m}_1=0$
C. $\mathrm{n}=2, \mathrm{I}=1, \mathrm{~m}_1=1$
D. $\mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_1=1$
E. $\mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_1=0$
Choose the correct answer from the options given below:
B and C Only
C and D Only
A and B Only
D and E Only
Explanation
| orbital | |
|---|---|
| $\mathrm{A}: \mathrm{n}=1, \ell=0, \mathrm{~m}_{\ell}=0$ | 1s |
| $\mathrm{B}: \mathrm{n}=2, \ell=0, \mathrm{~m}_{\ell}=0$ | 2s |
| $\mathrm{C}: \mathrm{n}=3, \ell=1, \mathrm{~m}_{\ell}=1$ | 3p |
| $\mathrm{D}: \mathrm{n}=3, \ell=2, \mathrm{~m}_{\ell}=1$ | 3d |
| $\mathrm{E}: \mathrm{n}=3, \ell=2, \mathrm{~m}_{\ell}=0$ | 3d |
In absence of electric and magnetic fields, all orbitals of 3d are degenerate
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