NEET Chemistry: Hydrogen bonding Practice Questions

Correct answer: D — Water (H₂O)

Water (H₂O) exhibits hydrogen bonding, which is the strongest intermolecular force, leading to higher boiling points and surface tension compared to the other options which rely primarily on van der Waals forces.

Correct answer: B — O-H, N-H, or F-H bond

Hydrogen bonding requires a large difference in electronegativity between the two bonded atoms, creating a significant partial positive charge on the H atom. This condition is primarily met when Hydrogen is covalently bonded to highly electronegative atoms like Oxygen (O), Nitrogen (N), or Fluorine (F).

Correct answer: C — The ability of the molecules to act as both hydrogen bond donors and acceptors (donor-acceptor capability) and their geometry

The strength of hydrogen bonding depends on the specific interaction between a hydrogen atom covalently bonded to a highly electronegative atom (like N, O, or F) and a lone pair of electrons on another electronegative atom. Therefore, the donor-acceptor capability and the resulting molecular geometry dictate the efficiency and strength of the H-bond formed.

Correct answer: A — Hydrogen Bonding

Hydrogen bonding is a special, strong type of dipole-dipole interaction that occurs when a hydrogen atom covalently bonded to a highly electronegative atom forms an attractive force with a lone pair on another nearby electronegative atom (N, O, or F).

Correct answer: C — More open (less compact)

Hydrogen bonding often leads to less symmetrical, more open arrangements (like in alcohols or water) because the interaction must accommodate the geometry required for optimal H-bond formation with neighboring molecules.

Correct answer: A — NH₃ and H₂O

Hydrogen bonding requires the presence of H bonded to N, O, or F. Among the options, NH₃ (ammonia) and H₂O (water) both have N-H and O-H bonds, allowing them to form hydrogen bonds with each other.

Correct answer: B — Increased solubility in non-polar solvents

Strong hydrogen bonding increases intermolecular attraction, which leads to higher boiling points and stronger cohesive forces, making the substance less soluble in non-polar solvents, contradicting the last option.

Correct answer: D — The presence of lone pairs on highly electronegative atoms (N, O, F)

Hydrogen bonding requires a hydrogen atom covalently bonded to a highly electronegative atom (N, O, or F) to create a substantial partial positive charge, allowing it to attract another H atom.

Correct answer: C — The orientation of the H-bonds in 3D space

The lone pair on the Nitrogen atom creates an asymmetrical electron distribution, which dictates the spatial orientation of the bonding orbitals, influencing how H-bonds are formed with neighboring molecules.

Correct answer: A — The molecule must contain a hydrogen atom covalently bonded to a highly electronegative atom (N, O, or F).

Hydrogen bonding is specifically dependent on the presence of a hydrogen atom covalently bonded to a highly electronegative atom (N, O, or F), which creates a strong partial positive charge on H and a strong dipole in the bond.

Correct answer: A — Hydrogen Bonding

Water molecules exhibit strong hydrogen bonding due to the highly electronegative oxygen atom sharing electron pairs with hydrogen. This results in strong intermolecular attraction, which is the primary factor determining its properties.

Correct answer: D — O-H bond

Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (like N, O, or F), creating a strong partial positive charge on the H atom.

Correct answer: C — Hydrogen bonding

Water molecules exhibit strong hydrogen bonding due to the high electronegativity of oxygen and the presence of hydrogen bonded to highly electronegative atoms (F, O, N), making it the strongest intermolecular force in water.

Correct answer: C — Water (H₂O)

Water (H₂O) is highly polar and has a bent geometry, allowing for the formation of strong hydrogen bonds between adjacent molecules, resulting in a high boiling point. Methane and Carbon dioxide are nonpolar, and Oxygen is not typically studied in this context of H-bonding dominance in simple molecules compared to water.

Correct answer: C — Hydrogen Bonding

Hydrogen bonding is a specific, strong type of intermolecular force that occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (N, O, or F). This interaction is the primary driving force behind the cohesive properties of substances like water and ammonia.