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1 Electronic configurations, Auf-bau principle, Pauli principle, Hunds rule 1. Which of the following statements in relation to the hydrogen atom is correct? 1) 3s and 3p orbitals are of lower energy than 3d orbital. 2) 3s, 3p and 3d orbitals all have the same energy. 3) 3s orbital is lower in energy than 3p orbital. 4) 3p orbital is lower in energy than 3d orbitals. 2. Due to which of the following reasons the nitrogen has three unpaired electrons 1) Hund s rule 2) Aufbau principle 3) Pauli's principle 4) Heisenberg s principle 3. Electronic configuration of 19 K 39 is 1) 1s 2 2s 2 2p 6 3s 2 3p 6 3d 1 2) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 3) 1s 2 2s 2 2p 6 3s 2 3p 3 4s 1 3d 2 4) 1s 2 2s 2 2p 6 3s 2 3p 3 4s 2 3d 1 4. Two successive elements belonging to the 3d-series have the same number of electrons in the d-sub-shell. Their atomic numbers are 1) 22and 23 2) 23 and24 3) 24 and25 4) 27 and28 5. Transition metal X has a configuration [Ar] 3d 4 in its +3 oxidation state. The atomic number of the metal is 1) 26 2) 22 3) 19 4) 25
2 6. The valency shell electron configuration of an atom is 4s 2 4p 5. The maximum no. of electrons having parallel spin in this configuration is? 1) 7 2) 4 3) 3 4) 5 7. The number of unpaired electrons in the Fe 2+ ion (At no. = 26) is 1)4 2) 6 3) 2 4) 5 8. When 4s orbital in any atom is filled completely, the next electron goes to 1) 5s 2) 3d 3) 4d 4) 4f 9. Number of electrons with +1/2 spin in n=3 is 1) 18 2) 9 3) 3 4) Which of the following sets of quantum numbers represents the highest energy of an atom? 1) n = 3, l = 2, m = 1, s = + 1/2 2) n = 2, l =1, m = 0, s = +1/2 3) n = 3, l = 0, m = 0, s = +1/2 4) n = 3, l = 1, m = 1, s = +1/2 11. The following has the lowest number of unpaired electrons in the valence shell 1) S 2) N 3) C 4) F 12. The number of unpaired electrons present in the first excited state of chlorine atom is 1) 1 2) 3 3) 5 4) The number of electrons in M-shell of an element with atomic number 24 is 1) 6 2) 13 3) 5 4) If the atomic number of an element is 36, the total number of P electrons present in it is 1)18 2) 6 3) 12 4) 14
3 15. The number of unpaired electrons present in palladium (Z = 46) atom is 1) 1 2) 2 3) Zero 4) Which of the following has maximum number of unpaired electrons (atomic number of Mn is 25?) 1) Mn (v1l) 2) Mn (II) 3) Mn (III) 4) Mn (IV) 17. Which one of the following has more number of unpaired d-electrons? 1) Cr 2) Fe 2+ 3) Ni 2+ 4) Co Which of the following pair have identical ground state configuration? 1) Li + and He + 2) Cl and Ar 3) Na and K 4) Mg and Ne 19. The electronic configuration of sodium is 1) [Ne] 3s 2 2) [Ne] 3s 1 3) [Ar] 4s 1 4) [Ar] 4s Which of the following may represent the ground state of nitrogen atom? 1) 2) 3) 4) 21 (A): The electronic configuration of boron cannot be 1s 2 2s 3, (R): No two electrons in an atom can have the same set of all the four quantum numbers The correct answer is 1) Both (A) and (R) are true and (R) is the correct explanation of (A). 2) Both (A) and (R) are true and (R) is not the correct explanation of (A). 3) (A) is true but (R) is not true. 4) (A) is not true but (R) is true.
4 22. The correct valence electronic configuration for cu (z =29) is 1) 3d 9 4s 2 2) 3d 10 4s 1 3) 3d 10 4s 2 4) 3d 8 4s The configuration 1s 2 2s 2 2p 6 3s 2 3p 3 corresponds to 1) Ground state configuration of phosphorus 2) 1st excited state configuration of phosphorus 3) Ground state configuration of sulphur 4) 1st excited state configuration of sulphur 24. The configuration 1s 2 2s 1 2p x 1 2py 1 2p2 1 represents 1) Nitrogen atom (ground state) 2) Carbon atom (ground state) 3) An excited carbon atom 4) An excited nitrogen atom 25. The total number of d electrons present in Bromine atom (Z=35) is 1)10 2) 12 3) 15 4) Ca 2+ and k + have same 1) Protons 2) Neutrons 3) Electronic Configuration 4) Size 27. The number of unpaired electrons in the valence shell of silicon is 1) 2 2) 3 3) 1 4) The reason for chromium to have [Ar] 3d 5 4s 1 configuration instead of [Ar] 3d 4 4s 2 is 1) Pauli's exclusion principle 2) Aufbau principle 3) More exchange energy 4) Heisenberg's principle 29. In potassium the order of energy levels is 1) 4s > 3d 2) 4s < 3d 3) 4s < 3p 4) 4s = 3d
5 30. List-I List-II A) 1) Violation of Aufbau principle B) 2) Violation of Pauli s principle C) 3) Violation of Pauli s and Hund s rule D) 4) Violation of Aufbau and Hund s rule The Correct Match is 5) Violation Hund s rule A B C D A B C D 1) ) ) ) KEY 1)2 2)1 3) 2 4)3 5)4 6)2 7)1 8)2 9)2 10) 1 11)4 12)2 13)2 14)1 15)3 16)2 17)1 18)2 19)2 20)2 21)1 22)2 23)1 24)3 25)4 26)3 27)1 28)3 29)2 30)4
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