The strongest intermolecular hydrogen bonding interactions occur within: _____________?
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Answer: B. Ice
Explanation
Solid water, or ice, forms an extensive, highly ordered network of strong hydrogen bonds. Every water molecule participates in four tetrahedral hydrogen bonds with neighboring molecules. Low thermal agitation in the solid state allows these strong directional interactions to persist. Hydrogen bonding is a strong type of dipole-dipole attraction involving hydrogen bonded to electronegative atoms. Water molecules possess two hydrogen bond donors and two lone pair acceptor sites. The open crystalline lattice of ice makes solid water less dense than liquid water.
Ice floating on lakes insulates aquatic life below during freezing winter weather conditions. Biological macromolecule structures like DNA rely heavily on hydrogen bonding for stability. Unusual high boiling points of hydrides are directly attributed to strong intermolecular hydrogen bonding. Ammonia gas features weaker hydrogen bonding due to lower nitrogen electronegativity than oxygen. Ethanol possesses bulky alkyl groups that sterically hinder extensive three-dimensional hydrogen bonding networks. Acetone and chloroform form weaker hydrogen bonds between different molecular species rather than pure networks.
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Answer: C. Sublimation
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Q3. The type of atomic hybridization exhibited by boron atoms in a diborane molecule is______?
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Answer: A. Sp- hybridisation
In diborane, the terminal boron atoms utilize sp3 hybrid orbitals, though the bridging structure involves three-center two-electron bonds.
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Answer: C. drying agent
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