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3d< 4s………energy of orbitals

dZ2orbital..... 2 nodal planes

4s<4p<4d ….energy of orbitals in hydrogen atom

answer is A.

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Detailed Solution

(1) According to Hund's rule, all the degenerate orbitals are singly occupied with parallel spin and pauli's rule is two electrons in an orbital have opposite spins. (2) Based on (n+l)rule, energy of 3d(3+2) > 4s(4+0)(3) dZ2 orbital has Zero nodal planes.(4) In all single electron systems like H-atom energy depends only on principal quantum number

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