Chemical Bonding PYQs Set 1 (PDF)

Set 1 of 19 · Questions 1-30 of 568

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Bonding · Set 1 (Q1-30)
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1. $The calculated bond order of superoxide ion (O_{2}^{-})$ (1) $1.5$ (2) $1$ (3) $2.5$ (4) $2$ 2. $The correct order of increasing bond angles in the following triatomic species is$ (1) $NO2- < NO2+ < NO2$ (2) $NO2- < NO2 < NO2+$ (3) $NO2+ < NO2 < NO2-$ (4) $NO2+ < NO2- < NO2$ 3. $Match List I with List II List - I (Hybridization) A. sp^{3} B. dsp^{2} C. sp^{3} d D. sp^{3} d^{2} List - II (Orientation in Space) I. Trigonal bipyramidal II. Octahedral III. Tetrahedral IV. Square planar Choose the correct answer from the options given below:$ (1) $A-IV, B-III, C-I, D-II$ (2) $A-III, B-IV, C-I, D-II$ (3) $A-III, B-I, C-IV, D-II$ (4) $A-II, B-I, C-IV, D-III$ 4. $When ψ_{A} and ψ_{B} are the wave functions of atomic orbitals, then σ^{*} is represented by :$ (1) $ψ_{A} + 2 ψ_{B}$ (2) $ψ_{A} - ψ_{B}$ (3) $ψ_{A} + ψ_{B}$ (4) $ψ_{A} - 2 ψ_{B}$ 5. $Which one of the following compounds shows the presence of intramolecular hydrogen bond?$ (1) $H_{2} O_{2}$ (2) $HCN$ (3) $Cellulose$ (4) $Concentrated acetic acid$ 6. $Which of the following has the highest bond order?$ (1) $N_{2}$ (2) $O_{2}$ (3) $He_{2}$ (4) $H_{2}$ 7. $Molecular AB has a bond length of 1.61 A and a dipole moment of 0.38 D. The fractional charge on each atom (absolute magnitude) is: ( = 4.802 × esu)$ (1) $0.5$ (2) $0.05$ (3) $0$ (4) $1.0$ 8. $Arrange the following compounds in increasing order of their dipole moment : HBr, H_{2} S, NF_{3} and CHCl_{3}$ (1) $H_{2} S < HBr < NF_{3} < CHCl_{3}$ (2) $NF_{3} < HBr < H_{2} S < CHCl_{3}$ (3) $HBr < H_{2} S < NF_{3} < CHCl_{3}$ (4) $CHCl_{3} < NF_{3} < HBr < H_{2} S$ 9. $Stability of the species Li2, L i_{2}^{-} and L i_{2}^{+} increases in the order of :$ (1) $Li2 < L i_{2}^{+} < L i_{2}^{-}$ (2) $L i_{2}^{-} < L i_{2}^{+} < Li2$ (3) $Li2 < L i_{2}^{-} < L i_{2}^{+}$ (4) $L i_{2}^{-} < Li2 < L i_{2}^{+}$ 10. $In which of the following molecules, the central atom does not have sp3 hybridization?$ (1) $CH4$ (2) $SF4$ (3) $B F_{4}^{-}$ (4) $N H_{4}^{+}$ 11. $Which one of the following species does not exist under normal conditions ?$ (1) $Be2+$ (2) $Be2$ (3) $B2$ (4) $Li2$ 12. $Which statements are NOT TRUE about XeO2 F2 ?(A) It has a see-saw shape.(B) Xe has 5 electron pairs in its valence shell in XeO2 F2.(C) The O - Xe - O bond angle is close to 180\circ.(D) The F - Xe - F bond angle is close to 180\circ.(E) Xe has 16 valence electrons in XeO2 F2. Choose the correct answer from the options given below:$ (1) $(B) (C) and (E) Only$ (2) $(B) and (D) Only$ (3) $(A) and (D) Only$ (4) $(B) (D) and (E) Only$ 13. $The bond stability of N_{2}, N_{2}^{-} and N_{2}^{2 -} varies as$ (1) $N_{2} < N_{2}^{-} < N_{2}^{2 -}$ (2) $N_{2}^{-} < N_{2} < N_{2}^{2 -}$ (3) $N_{2}^{2 -} < N_{2}^{-} < N_{2}$ (4) $N_{2}^{-} < N_{2}^{2 -} < N_{2}$ 14. $Which of the following molecule(s) show/s paramagnetic behavior? (A) O_{2} (B) N_{2} (C) F_{2} (D) S_{2} (E) Cl_{2} Choose the correct answer from the options given below:$ (1) $A & C only$ (2) $A & E Only$ (3) $A & D Only$ (4) $B Only$ 15. $Find out the correct hybridisation of the central atom in BCl_{3}, PCl_{5}, NH_{3} and SF_{6} .$ (1) $(BCl_{3} : s p^{3}); (PCl_{5} : s p^{3} d^{2}); (NH_{3} : s p^{2}) and (SF_{6}) : (s p^{3} d)$ (2) $(BCl_{3} : s p^{2}); (PCl_{5} : s p^{3} d); (NH_{3} : s p^{3}) and (SF_{6} :) (s p^{3} d^{2})$ (3) $(BCl_{3} : s p^{2}); (PCl_{5} : s p^{3} d^{2}); (NH_{3} : s p^{2}) and (SF_{6}) : (s p^{3} d)$ (4) $(BCl_{3} : s p^{3}); (PCl_{5} : s p^{3} d); (NH_{3} : s p^{2}) and (SF_{6} :) (s p^{3} d^{2})$ 16. $The number of s p^{2} hybrid orbitals in a molecule of benzene is:$ (1) $24$ (2) $18$ (3) $12$ (4) $6$ 17. $Using molecular orbital theory predict which of the following species has the shortest bond length ?$ (1) $O_{2}^{+}$ (2) $O_{2}^{-}$ (3) $O_{2}^{2 -}$ (4) $O_{2}^{2 +}$ 18. $When O_{2} is converted into O_{2}^{+}$ (1) $both paramagnetic character and bond order increase$ (2) $bond order decreases$ (3) $paramagnetic character increases$ (4) $paramagnetic character decreases and the bond order increases.$ 19. $The bond lengths of C_{2}, N_{2} and B_{2} molecules are X_{1}, X_{2} and X_{3} pm respectively. The correct order of their bond lengths is$ (1) $X_{3} > X_{1} > X_{2}$ (2) $X_{2} > X_{3} > X_{1}$ (3) $X_{1} > X_{2} > X_{3}$ (4) $X_{1} > X_{3} > X_{2}$ 20. $In oxygen and carbon molecule the bonding is$ (1) $O_{2} : 1 σ, 1 π; C_{2} : 0 σ, 2 π$ (2) $O_{2} : 0 σ, 2 π; C_{2} : 2 σ, 0 π$ (3) $O_{2} : 1 σ, 1 π; C_{2} : 1 σ, 1 π$ (4) $O_{2} : 2 σ, 0 π; C_{2} : 0 σ, 2 π$ 21. $In which of the following bond angle is maximum?$ (1) $N H_{3}$ (2) $N H_{4}^{+}$ (3) $P C l_{3}$ (4) $S C l_{2}$ 22. $The correct order of the bond angles of the compounds SiCl_{4}, BF_{3}, BeCl_{2} and SF_{6} is$ (1) $BF_{3} > BeCl_{2} > SF_{6} > SiCl_{4}$ (2) $BeCl_{2} > SF_{6} > SiCl_{4} > BF_{3}$ (3) $BeCl_{2} > SiCl_{4} > BF_{3} > SF_{6}$ (4) $BeCl_{2} > BF_{3} > SiCl_{4} > SF_{6}$ 23. $From the following, identify the ions with same bond order. I. CN^{-} II. N_{2}^{+} III. O_{2}^{2 -} IV. NO^{+}$ (1) $I & II only$ (2) $II & III only$ (3) $I & IV only$ (4) $I & III only$ 24. $Given below are two statements. Statement I : O_{2}, C u^{2 +} and F e^{3 +} are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field. Statement II : NaCl and H_{2} O are weakly magnetized in opposite direction to magnetic field. In the light of the above statements, choose the most appropriate answer form the options given$ (1) $Both Statement I and Statement II are correct.$ (2) $Both Statement I and Statement II are incorrect.$ (3) $Statement I is correct but Statement II is incorrect.$ (4) $Statement I is incorrect but Statement II is correct.$ 25. $A diatomic molecule has a dipole moment of 1.2D. If the bond distance is , then fractional charge on each atom is_______ esu .$ 26. $Amongst B e F_{2}, B F_{3}, H_{2} O, N H_{3}, C C 1_{4} and HC1, the number of molecules with non-zero net dipole moment is__________.$ 27. $The total number of species from the following in which one unpaired electron is present, is _____N_{2}, O_{2}, C_{2}^{-}, O_{2}^{-}, O_{2}^{2 -}, H_{2}^{+}, CN^{-}, He_{2}^{+}$ 28. $The total number of molecules with zero dipole moment among CH_{4}, BF_{3}, H_{2} O, HF, NH_{3}, CO_{2} and SO_{2} is_______$ 29. $The total number of molecular orbitals formed from 2 s and 2 p atomic orbitals of a diatomic molecule$ 30. $AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on Molecular orbital theory, the bond order of AX is 2.5. The total number of electrons in AX is____ (Round off to the Nearest Integer).$