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Statement I ; Atomic orbital is the wave function $(ψ)$ of an electron in an atom
Statement II ; In hydrogen atom, energy of orbitals follow the order, $1 s < 2 s < 2 p < 3 s$

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Statements I and II are correct

Statement I is correct and statement II is incorrect

Statement I is incorrect and statement II is correct

Statements I and II are incorrect

answer is B.

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Detailed Solution

In hydrogen atom, energy of orbital depends on ‘n’ only but not on ‘l’ ;

Thus energy of $1 s < 2 s = 2 p < 3 s$

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