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Correct order energies of various orbitals in H-atom is

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1s = 2s

2s < 2p

4p < 4f

5s = 5d

answer is D.

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Detailed Solution

In H-atom, energy of orbitals depend on principal quantum number only ;

Energy of 1s<2s=2p<3s=3p=3d<4s=4p=4d=4f<5s=5p=5d=5f ;

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