Class XI

Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is
  1. more than unit electronic charge
  2. less than unit electronic charge
  3. double the unit electronic charge
  4. equal to unit electronic charge
The vapor pressure of different substances at the same temperature increases if
  1. the intermolecular forces of the substance are weak
  2. the molecules of the substance are ionic bonded
  3. the molecules of the substance are covalent bonded
  4. the intermolecular forces of the substance are strong
34.05 mL of phosphorus vapour weighs 0.0625 g at 546 ∘Cand 0.1 bar pressure. What is the molar mass of phosphorus?
  1. 1325.9 g
  2. 1097.6 g
  3. 1247.7 g
  4. 1120.3 g
Heat of vaporization is always larger than the Heat of fusion because
  1. it takes more energy to separate particles completely than just to free them from their random positions in the solid
  2. it takes less energy to separate particles completely than just to free them from their fixed positions in the solid
  3. it takes no energy to separate particles completely than just to free them from their oscillating positions in the solid
  4. it takes more energy to separate particles completely than just to free them from their fixed positions in the solid
Surface tension decreases as the temperature is raised because
  1. Increase in temperature increases the kinetic energy of the molecules and effectiveness of intermolecular attraction decreases
  2. Increase in temperature decreases the kinetic energy of the molecules and effectiveness of intermolecular attraction is not changed
  3. Increase in temperature decreases the kinetic energy of the molecules and effectiveness of intermolecular attraction decreases
  4. Increase in temperature increases the kinetic energy of the molecules and effectiveness of intermolecular attraction increases
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