Class XI

Water has high surface tension and high capillarity because of
  1. ionic bonds
  2. Hydrogen bonds
  3. dispersion forces
  4. covalent bonds
Capillarity results from a competition between the
  1. intermolecular forces within tubewall and intramolecular forces within tubewall
  2. intermolecular forces within liquid and intramolecular forces within liquid
  3. intramolecular forces within the liquid (cohesive forces) and those between the liquid and the tube walls (adhesive forces)
  4. intermolecular forces within the liquid (cohesive forces) and those between the liquid and the tube walls (adhesive forces)
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
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
How does the surface tension of a liquid vary with increase in temperature?
  1. Increases
  2. Decreases
  3. No regular pattern is followed
  4. Remains same
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