When NaCI in water. aqueous Na^+ and cr^- ions result what is the name of the at

Question

When NaCI in water. aqueous Na^+ and cr^- ions result what is the name of the attractions that exists between Na^+ and H _2 O? London dispersion force dipole-dipole ion-ion hydrogen bonding ion-dipole Hydrogen bonding is a special case of _____ ion-ion interactions London-dispersion forces ion-dipole attraction dipole-dipole attractions none of the above What types of intermolecular forces exist between HI and H _2 S? dipole-dipole and ion-dipole dispersion forces, dipole-dipole, and ion-dipole dispersion forces, hydrogen bonding, dipole-dipole, and ion-dipole dispersion forces and dipole-dipole dispersion forces and ion-dipole

Explanation / Answer

26. (e) ion-dipole interaction.The water molecules form a solvent cage around each Na+ or Cl- ion.The positive ion ,Na+,is surrounded by water molecules that have the negative dipoles of water or the oxygen pointing towards the cation.

Similarly the anions are solvated by the positive dipoles of water.

27. (D) Hydrogen bonding is a case of dipole-dipole interaction.It is an attraction between a slightly positive hydrogen on one molecule and a slightly negative atom on another molecule.The large electronegativity differences between hydrogen atoms and other atoms such as fluorine,oxygen causes the bond between them to be polar.

28.(D) Dispersion forces and dipole forces are present between HI and H2S.No hydrogen bonding is possible.Thus dispersion forces between iodide ions and sulphide ions and dipole forces between hydrogen,iodide and suphide ions are present.

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