Q.

For ‘H’ atom the correct order of energy level is

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a

2s < 2p

b

3s < 3p < 3d

c

1s < 2s

d

2s < 3p < 3d

answer is C.

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Detailed Solution

For 1e- system E depends only on ‘n’ but not on (n+l) value.1s<2s=2p<3s=3p=3d<4s=4p=4d=4f…….
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