This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part I > Class 11 Chemistry (Part I) Chapter 4 Chemical Bonding And Molecular Structure – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 4 Chemical Bonding And Molecular Structure Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When drawing Lewis structures, all elements follow the ..... rule (except H and He) in order to be the most stable. A) Triad Rule. B) Octet Rule. C) Duet Rule. D) Octave Rule. Show Answer Correct Answer: B) Octet Rule. 2. Which of the following molecules exhibits resonance? A) O3. B) CO2. C) N2. D) H2O. Show Answer Correct Answer: A) O3. 3. Which of the following statements is true regarding the octet rule? A) It is universally applicable. B) It is only applicable to noble gases. C) It applies to all elements. D) It is useful for understanding organic compounds. Show Answer Correct Answer: D) It is useful for understanding organic compounds. 4. NH$_{3}$ has how many lone pairs? A) 0. B) 2. C) 3. D) 1. Show Answer Correct Answer: D) 1. 5. In MOST compounds, atoms form bonds so that the number of valence electrons of each atom is ..... A) 6. B) 10. C) 2. D) 8. Show Answer Correct Answer: D) 8. 6. What is the term used to describe the equilibrium distance between the nuclei of two bonded atoms in a molecule? A) Bond Radius. B) Bond Angle. C) Bond Energy. D) Bond Length. Show Answer Correct Answer: D) Bond Length. 7. What are isoelectronic species? A) Same number of electrons. B) Same number of neutrons. C) Same number of protons. D) All the above. Show Answer Correct Answer: A) Same number of electrons. 8. Which one of the following is a correct set? (2003-E) A) CH4, tetrahedral. B) H2O, linear. C) H2O, angular. D) NH4+, square planar. Show Answer Correct Answer: C) H2O, angular. 9. Which of the following is not tetrahedral A) SO42-. B) CO23-. C) BF4-. D) NH4+. Show Answer Correct Answer: B) CO23-. 10. How does the electron configuration of an atom determine its chemical properties? A) Chemical properties are determined by the number of protons in the nucleus. B) The electron configuration has no impact on chemical properties. C) The electron configuration dictates the atom's reactivity, bonding tendencies, and overall chemical behavior. D) Electron configuration only affects physical properties, not chemical ones. Show Answer Correct Answer: C) The electron configuration dictates the atom's reactivity, bonding tendencies, and overall chemical behavior. 11. Describe the VSEPR theory and its importance in molecular geometry. A) VSEPR theory has no impact on molecular properties. B) The VSEPR theory is important in determining the shape of molecules, which in turn influences their physical and chemical properties. C) The VSEPR theory is used to predict the color of molecules. D) VSEPR theory is only applicable to inorganic compounds. Show Answer Correct Answer: B) The VSEPR theory is important in determining the shape of molecules, which in turn influences their physical and chemical properties. 12. What is the angle defined as the angle between the nuclei of two bonded atoms in a molecule? A) Bond Torsion. B) Atomic Angle. C) Bond Angle. D) Molecular Angle. Show Answer Correct Answer: C) Bond Angle. 13. Find out total number of of bond pair and lone pair in XeF3+ A) LP-2 BP-3. B) LP-3 BP-2. C) LP-0 BP-0. D) None of the above. Show Answer Correct Answer: A) LP-2 BP-3. 14. Of the possible bonds between carbon atoms (single, double, and triple), ..... A) A double bond is longer than a triple bond. B) A single bond is stronger than a triple bond. C) A triple bond is longer than a single bond. D) A double bond is stronger than a triple bond. Show Answer Correct Answer: A) A double bond is longer than a triple bond. 15. What is the attractive force that holds various constituents together in different chemical species called? A) Chemical Bond. B) Molecular Force. C) Atomic Bond. D) Ionic Force. Show Answer Correct Answer: A) Chemical Bond. 16. If four orbitals on one atom overlap four orbitals on a second atom, how many molecular orbitals will form? A) 1. B) 4. C) 8. D) 16. E) None of the answers are correct. Show Answer Correct Answer: C) 8. 17. Find the molecule with the maximum dipole moment A) NF$_{3}$. B) NH$_{3}$. C) CH$_{4}$. D) CO$_{2}$. Show Answer Correct Answer: B) NH$_{3}$. 18. Which type of bond is formed by the end-to-end overlap of atomic orbitals? A) Hydrogen bond. B) Sigma bond. C) Delta bond. D) Pi bond. Show Answer Correct Answer: B) Sigma bond. 19. The shape of IF$_{7 }$molecule is A) Trigonal bipyramidal. B) Pentagonal Bipyramidal. C) All the above. D) None of the above. Show Answer Correct Answer: B) Pentagonal Bipyramidal. 20. Which of the following statements about resonance structures is true? A) They represent the same energy state. B) They are used to depict accurate structures of molecules. C) They have real existence. D) They exist in equilibrium. Show Answer Correct Answer: B) They are used to depict accurate structures of molecules. 21. Polyatomic ions are- A) Ions of commonly occurring compounds. B) Elements with multiple ions. C) Ions with multiple charges. D) Ions made up of multiple of the same element. Show Answer Correct Answer: A) Ions of commonly occurring compounds. 22. What is the shape of the NH3 molecule? A) Trigonal Pyramidal. B) Tetrahedral. C) Bent. D) Linear. Show Answer Correct Answer: A) Trigonal Pyramidal. 23. What is the bond enthalpy of a bond? A) The energy associated with the lattice structure. B) The energy required to break one mole of bonds in a gaseous state. C) The energy released when a bond is formed. D) The energy required to ionize an atom. Show Answer Correct Answer: B) The energy required to break one mole of bonds in a gaseous state. 24. In which of the following substances will hydrogen bond be strongest? A) HCl. B) H$_{2}$O. C) HI. D) H$_{2}$S. Show Answer Correct Answer: B) H$_{2}$O. 25. According to the octet rule, how many electrons do atoms strive to have in their outer shell? A) 4. B) 6. C) 8. D) 2. Show Answer Correct Answer: C) 8. 26. Electric Conductivity A) A chemical formula that shows the arrangement of atoms in a molecule or a polyatomic ion. B) A property that describes the ability of an electric current to pass through a material. C) A property that describes the ability of the material to be pulled into thin wire without breaking. D) The arrangement of electrons in relation to the central atom of the molecule. Show Answer Correct Answer: B) A property that describes the ability of an electric current to pass through a material. 27. Which of the following statement is correct regarding SF4 molecule? A) SF4 has SP$^{3}$d hybridisation. B) SF4 molecule is bent shaped. C) SF4 has SP3d$^{2}$ hybridisation. D) SF4 molecule hasTrigonal bipyramidal shape. Show Answer Correct Answer: A) SF4 has SP$^{3}$d hybridisation. 28. Which of the following angle corresponds to sp2 hybridisation? A) 109$^\circ$. B) 120$^\circ$. C) 180$^\circ$. D) 90$^\circ$. Show Answer Correct Answer: B) 120$^\circ$. 29. Which among the following chemical bond were described by Kossel and Lewis? A) Metallic bond. B) Polar covalent bond. C) Coordinate bond. D) Ionic and Covalent bond. Show Answer Correct Answer: D) Ionic and Covalent bond. 30. How are covalent bonds explained? A) When one atom takes the other atom's electron. B) When the two nucleus merge. C) When the atom shares an electron with an another atom. D) When the neutrons leave the nucleus. Show Answer Correct Answer: C) When the atom shares an electron with an another atom. 31. What is the coordination number of the ionic lattice of NaCL? A) 2. B) 6. C) 4. D) 8. Show Answer Correct Answer: B) 6. 32. What is the hybridisation state of the central atom in the conjugate base of NH4+ ion? (2002-E) A) Dsp2. B) Sp. C) Sp3. D) Sp2. Show Answer Correct Answer: C) Sp3. 33. How many unshared pairs of electrons will the central atom of a bent molecule have? A) 2. B) 1. C) 4. D) 3. Show Answer Correct Answer: A) 2. 34. Which of the following statements about Lewis structures is true? A) They show the arrangement of valence electrons. B) They cannot be used for polyatomic ions. C) They represent actual shapes of molecules. D) They only apply to ionic compounds. Show Answer Correct Answer: A) They show the arrangement of valence electrons. 35. Which of the following is a favourable factor for cation formation? A) Low ionisation potential. B) High electron affinity. C) High electronegativity. D) Small atomic size. Show Answer Correct Answer: A) Low ionisation potential. 36. Which type of bond is formed by the sharing of a pair of electrons between atoms? A) Hydrogen Bond. B) Metallic Bond. C) Covalent Bond. D) Ionic Bond. Show Answer Correct Answer: C) Covalent Bond. 37. The geometry of a molecule with 2 bonded pairs of electrons and 0 lone pairs of electrons A) Linear. B) Bent. C) Trigonal Pyramidal. D) Tetrahedral. E) Trigonal Planar. Show Answer Correct Answer: A) Linear. 38. When atoms share electrons, the electrical attraction of an atom for the shared electrons is called the atom's A) Electronegativity. B) Resonance. C) Hybridization. D) Electron affinity. Show Answer Correct Answer: A) Electronegativity. 39. What is the bond angle in a water molecule (H-O-H)? A) 180 degrees. B) 104.5 degrees. C) 109.5 degrees. D) 120 degrees. Show Answer Correct Answer: B) 104.5 degrees. 40. Which of the following is a characteristic of ionic compounds? A) They are poor conductors of electricity in solid form. B) They have low melting points. C) They consist of orderly arrangements of cations and anions. D) They are formed from non-metallic elements only. Show Answer Correct Answer: C) They consist of orderly arrangements of cations and anions. 41. What is the bond order of the O2 molecule? A) 1. B) 3. C) 0. D) 2. Show Answer Correct Answer: D) 2. 42. Which of the following molecules has a pyramidal shape? A) H2O. B) NH3. C) CO2. D) CH4. Show Answer Correct Answer: B) NH3. 43. If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0 D respectively, what is the percent ionic character of the bond? (2003-E) A) 16.66. B) 12.33. C) 10.66. D) 19.33. Show Answer Correct Answer: A) 16.66. 44. Which of the following has a full valence shell? A) Carbon. B) Barium. C) Neon. D) Oxygen. Show Answer Correct Answer: C) Neon. 45. What is the bond order in a molecule with three shared electron pairs? A) 4. B) 2. C) 1. D) 3. Show Answer Correct Answer: D) 3. 46. What is the significance of Lewis symbols in chemical bonding? A) They show the molecular weight. B) They indicate the number of valence electrons. C) They depict the electron cloud. D) They represent the atomic mass. Show Answer Correct Answer: B) They indicate the number of valence electrons. 47. What is the primary factor that determines the stability of an ionic compound? A) The lattice enthalpy. B) The number of valence electrons. C) The type of bond formed. D) The size of the ions. Show Answer Correct Answer: A) The lattice enthalpy. 48. The geometry of a molecule with 1 bonded pair of electrons and 1 lone pair of electrons A) Tetrahedral. B) Trigonal Planar. C) Bent. D) Trigonal Pyramidal. E) Linear. Show Answer Correct Answer: E) Linear. 49. Which one has a pyramidal shape? A) NO$_{3}$ $^{-}$. B) CO$_{3}$ $^{2-}$. C) PCl$_{3}$. D) SO$_{3}$. Show Answer Correct Answer: C) PCl$_{3}$. 50. Which of the following best describes bond length? A) The distance between two molecules of the same substance. B) The distance between the nuclei of two attached atoms. C) The distance between the orbitals of two attached atoms. D) The distance between the electrons in two attached atoms. Show Answer Correct Answer: B) The distance between the nuclei of two attached atoms. 51. What is the significance of valence electrons in chemical bonding? A) Valence electrons repel each other, preventing bonding. B) Valence electrons are only present in noble gases. C) Valence electrons have no impact on chemical bonding. D) Valence electrons play a crucial role in forming chemical bonds between atoms. Show Answer Correct Answer: D) Valence electrons play a crucial role in forming chemical bonds between atoms. 52. The 2 shared electrons that hold the molecule together A) Central atom. B) Bonded pair. C) Terminal atom. D) Lone pair. Show Answer Correct Answer: B) Bonded pair. 53. A valid Lewis structure of ..... cannot be drawn without violating the octet rule. A) PF$_{3}$. B) NF$_{3}$. C) SbF$_{3}$. D) IF$_{3}$. Show Answer Correct Answer: D) IF$_{3}$. 54. What is the term for the energy required to break one mole of bonds in a gaseous state? A) Bond order. B) Bond energy. C) Bond enthalpy. D) Bond length. Show Answer Correct Answer: C) Bond enthalpy. 55. How many electrons can be used in the Lewis Structure for:NO$_{3}$- A) 18. B) 23. C) 20. D) 24. Show Answer Correct Answer: D) 24. 56. Which of the following best describes the molecular structure of water (H2O)? A) Trigonal Planar. B) Tetrahedral. C) Bent. D) Linear. Show Answer Correct Answer: C) Bent. 57. What is the primary factor that determines the strength of a covalent bond? A) Extent of overlap. B) Bond length. C) Number of electrons. D) Type of atoms involved. Show Answer Correct Answer: A) Extent of overlap. 58. Explain the difference between cations and anions. A) Cations are negatively charged ions, and anions are positively charged ions. B) Cations have a higher electron affinity than anions. C) Cations are positively charged ions, and anions are negatively charged ions. D) Cations are larger in size compared to anions. Show Answer Correct Answer: C) Cations are positively charged ions, and anions are negatively charged ions. 59. Determine the hybridisation of PCl5 A) Sp3. B) Sp3d2. C) Sp3d. D) None of the above. Show Answer Correct Answer: C) Sp3d. 60. The formula unit of an ionic compound shows the: A) Number of nearest neighboring ions surrounding each kind of ion. B) Total number of each kind of ion in a sample. C) Numbers of atoms within each molecule. D) Simplest ratio of the ions. Show Answer Correct Answer: D) Simplest ratio of the ions. 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