Class XI

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
A student forgot to add the reaction mixture to the round bottomed flask at 27 ∘Cbut instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 ∘C. What fraction of air would have been expelled out?
  1. 3/ 7
  2. 41338.0
  3. 1/ 2
  4. 2/ 3
Hot H2can reduce copper(II) oxide, forming the pure metal and H2O. What volume of H2at 765 torr and 225∘C is needed to reduce 35.5 g of copper(II) oxide?
  1. 18.1 L
  2. 15.7 L
  3. 22.3 L
  4. 13.1 L
Water has high surface tension and high capillarity because of
  1. ionic bonds
  2. Hydrogen bonds
  3. dispersion forces
  4. covalent bonds
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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