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Solution


Q.

For hydrogen atom, the orbital/s with lowest energy is/are:

(A)  4s
(B)  3px
(C)  3dx2-y2
(D)  3dz2
(E)  4pz

Choose the correct answer from the options given below:              [2025]
1 (B) only  
2 (A) only  
3 (A) and (E) only  
4 (B), (C) and (D) only  

Ans.

(4)

For single electron species, energy of an orbital depends only on value of n (and not on value of n + 1). Lesser is value of n, lesser is energy. And orbitals with same value of n have same energy.