This quiz works best with JavaScript enabled. Home > Class 11 > 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 (25 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) Octave Rule. B) Duet Rule. C) Triad Rule. D) Octet Rule. Show Answer Correct Answer: D) Octet Rule. 2. Which of the following molecules exhibits resonance? A) H2O. B) CO2. C) O3. D) N2. Show Answer Correct Answer: C) 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) 1. C) 2. D) 3. Show Answer Correct Answer: B) 1. 5. In MOST compounds, atoms form bonds so that the number of valence electrons of each atom is ..... A) 2. B) 6. C) 8. D) 10. Show Answer Correct Answer: C) 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 Length. D) Bond Energy. Show Answer Correct Answer: C) 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) H2O, angular. B) H2O, linear. C) NH4+, square planar. D) CH4, tetrahedral. Show Answer Correct Answer: A) H2O, angular. 9. Brittleness A) The tendency of a mineral to fracture or break when pressure is applied. B) The arrangement of electrons in relation to the central atom of the molecule. C) A chemical formula that shows the arrangement of atoms in a molecule or a polyatomic ion. D) A notation that depicts valence electrons as dots around the atomic symbol of the element; also known as a Lewis dot formula. Show Answer Correct Answer: A) The tendency of a mineral to fracture or break when pressure is applied. 10. Which of the following is not tetrahedral A) BF4-. B) NH4+. C) CO23-. D) SO42-. Show Answer Correct Answer: C) CO23-. 11. 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. 12. 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. 13. What is the angle defined as the angle between the nuclei of two bonded atoms in a molecule? A) Bond Angle. B) Molecular Angle. C) Atomic Angle. D) Bond Torsion. Show Answer Correct Answer: A) Bond Angle. 14. 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. 15. Of the possible bonds between carbon atoms (single, double, and triple), ..... A) A triple bond is longer than a single bond. B) A double bond is stronger than a triple bond. C) A single bond is stronger than a triple bond. D) A double bond is longer than a triple bond. Show Answer Correct Answer: D) A double bond is longer than a triple bond. 16. What is the attractive force that holds various constituents together in different chemical species called? A) Molecular Force. B) Ionic Force. C) Chemical Bond. D) Atomic Bond. Show Answer Correct Answer: C) Chemical Bond. 17. 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. 18. Find the molecule with the maximum dipole moment A) CH$_{4}$. B) NH$_{3}$. C) CO$_{2}$. D) NF$_{3}$. Show Answer Correct Answer: B) NH$_{3}$. 19. Which type of bond is formed by the end-to-end overlap of atomic orbitals? A) Delta bond. B) Sigma bond. C) Pi bond. D) Hydrogen bond. Show Answer Correct Answer: B) Sigma bond. 20. 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. 21. Which of the following statements about resonance structures is true? A) They are used to depict accurate structures of molecules. B) They represent the same energy state. C) They have real existence. D) They exist in equilibrium. Show Answer Correct Answer: A) They are used to depict accurate structures of molecules. 22. Polyatomic ions are- A) Ions made up of multiple of the same element. B) Ions of commonly occurring compounds. C) Ions with multiple charges. D) Elements with multiple ions. Show Answer Correct Answer: B) Ions of commonly occurring compounds. 23. What is the shape of the NH3 molecule? A) Linear. B) Tetrahedral. C) Trigonal Pyramidal. D) Bent. Show Answer Correct Answer: C) Trigonal Pyramidal. 24. Which of the following statement is wrong? A) The combining atomic orbitals must have same or nearly same energies. B) The extent of overlapping betwen the atomic orbitals of the two atoms shold be large. C) The combining atomic orbitals must have different energies. D) The combinig atomic orbitals must have the same symmetry. Show Answer Correct Answer: C) The combining atomic orbitals must have different energies. 25. What is the bond enthalpy of a bond? A) The energy associated with the lattice structure. B) The energy required to ionize an atom. C) The energy released when a bond is formed. D) The energy required to break one mole of bonds in a gaseous state. Show Answer Correct Answer: D) The energy required to break one mole of bonds in a gaseous state. 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