JEE Advanced 2015 · Paper 1 · Chemistry Q26

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ChemistryInteger+4Question 26 of 60

Not considering the electronic spin, the degeneracy of the second excited state $(n=3)$ of H atom is 9, while the degeneracy of the second excited state of $\ce{H-}$ is

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Answer and worked solution

Official answer: 3

In H⁻ (two electrons), orbital energies depend on both $n$ and $l$ : 1s < 2s < 2p.

Ground state: 1s².
First excited state: 1s¹2s¹.
Second excited state: 1s¹2p¹, which has the 3-fold degeneracy of the p orbitals.

Answer: 3

Topics:Quantum numbers Orbitals and their shapes

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JEE Advanced 2015 · Paper 1, Chemistry question 26