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NEET Questions / Chemistry / Chemical Bonding and Molecular Structure / Introduction, Covalent Bond
Which of the following statements regarding the formation of a covalent bond is INCORRECT?
The formation of a covalent bond always results in a net decrease in potential energy, leading to greater stability compared to isolated atoms.
Overlapping of atomic orbitals leads to increased electron density between the nuclei, contributing to bond formation.
The strength of a covalent bond is inversely proportional to the extent of orbital overlap.
The stability of a covalent bond arises from the balance between attractive forces between nuclei and electrons, and repulsive forces between nuclei and between electrons.
Which combination of factors would MOST likely lead to the formation of a highly polar covalent bond between two atoms, X and Y?
Small difference in electronegativity between X and Y; minimal overlap of atomic orbitals.
Large difference in electronegativity between X and Y; minimal overlap of atomic orbitals.
Large difference in electronegativity between X and Y; significant overlap of atomic orbitals.
Similar electronegativities of X and Y; significant overlap of atomic orbitals.
The molecule exhibits a trigonal bipyramidal geometry. Which of the following BEST explains the difference in bond lengths between axial and equatorial bonds in ?
Difference in hybridization of axial and equatorial chlorine atoms.
Unequal sharing of electrons between phosphorus and axial vs. equatorial chlorine atoms.
Greater repulsion experienced by axial bond pairs due to 90° interactions with equatorial bond pairs.
The presence of d-orbitals in phosphorus preferentially influences axial bond lengths.
Which of the following is NOT a characteristic of a coordinate covalent bond?
Both atoms involved in the bond contribute one electron each to the shared pair.
One atom donates both electrons of the shared pair.
The bond is formed between a Lewis acid and a Lewis base.
The bond is essentially identical to a regular covalent bond once formed.
A molecule has a bond angle of 180°. Assuming that the central atom X follows the octet rule and forms no coordinate bonds, which of the following statements regarding the molecule is MOST likely FALSE?
The central atom X uses hybrid orbitals for bonding.
The molecule is linear.
The central atom X has no lone pairs of electrons.
The molecule must be polar if X and Y have different electronegativities.
Which of the following statements is INCORRECT regarding covalent bonds?
Covalent bonds involve the sharing of electron pairs between atoms.
Covalent bonds can result in the formation of molecules with definite shapes.
Covalent bonds always form between different elements.
Covalent bonds can be single, double, or triple, depending on the number of shared electron pairs.
A molecule of XCl₂ has a linear shape. What can be inferred about the central atom X?
X has two bonding pairs and one lone pair of electrons.
X has two bonding pairs and two lone pairs of electrons.
X has two bonding pairs and three lone pairs of electrons.
X has two bonding pairs and no lone pairs of electrons.
