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Statement-I : In the line spectra observed in the case of multi electron atoms, some lines actually occur in doublets, triplets etc.
Statement-II : Energies of the orbitals in the same sub shell decrease with increase in the atomic number (Z_eff)

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if both statement I and statement II are correct

if both statement I and statement II are incorrect

if Statement I is correct, but statement II is incorrect

if Statement I is incorrect, but statement II is correct

answer is A.

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Detailed Solution

S-I is the basis for the proposal of spin quantum number, Evidence for S-II is
$E_{2 s} (H) > E_{2 s} (Li) > E_{2 s} (Na) > E_{2 s} (K)$

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