Chapter 10: Chemical Bonding — Online MCQ Test
CHEMISTRY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 10: Chemical Bonding with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers Lewis structures ionic covalent metallic bonding and Kossel-Lewis approach. Students master VSEPR theory valence bond theory hybridization concepts molecular or....
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Chapter 10: Chemical Bonding — Important Questions & Answers
According to the Lewis electron-dot concept, chemical bonding mainly involves the transfer or sharing of which particles?
- A. Protons
- B. Neutrons
- C. Valence electrons
- D. Nucleus
Answer: C. Valence electrons
Lewis theory explains bonding in terms of valence electrons. These outermost electrons are transferred in ionic bonds or shared in covalent bonds.
Lewis theory explains bonding in terms of valence electrons. These outermost electrons are transferred in ionic bonds or shared in covalent bonds.
Which of the following is an example of an ionic bond?
- A. H2
- B. NaCl
- C. Cl2
- D. CH4
Answer: B. NaCl
NaCl is formed by transfer of an electron from sodium to chlorine, producing Na+ and Cl− ions. This is characteristic of ionic bonding.
NaCl is formed by transfer of an electron from sodium to chlorine, producing Na+ and Cl− ions. This is characteristic of ionic bonding.
Which of the following is the correct electron-pair geometry of NH3 according to VSEPR theory?
- A. Trigonal planar
- B. Tetrahedral
- C. Linear
- D. Octahedral
Answer: B. Tetrahedral
NH3 has four electron pairs around nitrogen: three bond pairs and one lone pair. The electron-pair geometry is tetrahedral, though the molecular shape is trigonal pyramidal.
NH3 has four electron pairs around nitrogen: three bond pairs and one lone pair. The electron-pair geometry is tetrahedral, though the molecular shape is trigonal pyramidal.
Which of the following statements is NOT correct about molecular orbital theory?
- A. Atomic orbitals combine to form molecular orbitals
- B. Bonding molecular orbitals are lower in energy than antibonding molecular orbitals
- C. Electrons in molecular orbitals belong to the entire molecule
- D. All molecular orbitals are localized between two atoms only
Answer: D. All molecular orbitals are localized between two atoms only
Molecular orbitals are delocalized over the whole molecule, not confined between just two atoms. This is a key feature of MO theory.
Molecular orbitals are delocalized over the whole molecule, not confined between just two atoms. This is a key feature of MO theory.
Which is the correct order of bond length for C-C bonds?
- A. Single > Double > Triple
- B. Triple > Double > Single
- C. Double > Single > Triple
- D. Single = Double = Triple
Answer: A. Single > Double > Triple
Bond length decreases as bond order increases because stronger bonds hold atoms closer together. Therefore, single bonds are longest and triple bonds are shortest.
Bond length decreases as bond order increases because stronger bonds hold atoms closer together. Therefore, single bonds are longest and triple bonds are shortest.