Consider the phase diagram for CO_2. The letters indicate specific points in the

Question

Consider the phase diagram for CO_2. The letters indicate specific points in the phase diagram In going from point A to B to C, what phase transitions does CO_2 undergo? fusion followed by evaporation fusion followed by sublimation sublimation followed by condensation evaporation followed by fusion condensation followed by fusion In which substance would the dispersion forces be weakest? He Ne Ar Which of the following substances would exhibit dipole-dipole intermolecular forces? BCl_2 CF_4 CO_2 Which of the following would have the lowest vapor pressure at 0 degree C? CH_4 CH_2 Cl_2 NH_3 For which of the following is hydrogen-bonding nor an important intermolecular force? N_2 CH_3 NH_2

Explanation / Answer

6) E. Condensation followed by fusion

Regions A, B and C represent gaseous, solid and liquid CO2 respectively. From A to B, CO2 vapours condense to form solid and from B to C, solid fuses into liquid CO2.

7) A. He

Dispersion forces directly depend on size. Smaller the size of the atom, weaker the dispersion forces. As He is the smallest among all, it has the weakest dispersion forces.

8) E. NH3

Dipole-dipole interactions exist between polar molecules. NH3 is the only polar molecule among the listed species.

9) E. CH3OH

Vapour pressure depends on intermolecular forces. Stronger the forces, more the tendency of the liquid to stay associated, lower the vaporization. CH3OH is associated by very strong intermolecular hydrogen bonds which causes it to have the least vapor pressure.

10) A. N2

N2 has no hydrogen bonds as it has no hydrogen atoms.

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