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Q.

Not considering the electronic spin the degeneracy or the second excited state (n=3) of H-atom is 9, whereas the degeneracy of the second excited state of H− is :

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answer is 3.

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Detailed Solution

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degeneracy = 9 for H-atom  because 3s=3p=3d

for H−1s<2s<2p<3s

1st excited state 2s 

2nd excited state 2p

Hence, degeneracy of 2nd excited state= 3

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