Q100 · CSIR-NET Chemistry, December 2012

Paper: CSIR-NET December 2012 · Subject: Physical Chemistry · Chapter: Quantum Chemistry · Topic: Hydrogen Atom · Marks: 2 · Difficulty: Medium

The energy of a hydrogen atom in a state is $\frac{-h_{c} R_{H}}{25}\left(R_{H}=R y d b e r g\right.$ constant $)$. The degeneracy of the state will be
(a)5
(b)10
(c)25
(d)50
Answer
Answer: C ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation
E = −R_H/25 corresponds to n = 5, whose degeneracy (ignoring spin) is n² = 25.

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