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Consider the following statements and identify correct statement(s)
(A) In K energy of 4s orbital is lower than energy of 3d orbital
(B) In Sc 4p orbital is filled first than 3d orbital
(C) Energy of 2s orbital of hydrogen atom is lesser than energy of 2s orbital of lithium
(D) Energy of 2s orbital of potassium is lesser than energy of 2s orbital of sodium

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A and D

B,C and D

A and C

A ,B and D

answer is D.

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Detailed Solution

In K energy of 4s < 3d

In Sc energy of 3d < 4p so 3p orbital is filled first

energies of orbitals in the same sub shells decreases with increase in atomic number

energy of 2s(H) > 2s(Li)

energy of 2s (Na) > 2s (K)

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