Class XII

Which allotrope of phosphorous is most stable?
  1. White
  2. Red
  3. Black
  4. Blue
Ammonia has a higher boiling point and is less volatile because of
  1. Hydrogen bond
  2. Covalent bond
  3. Vander waal forces
  4. Dipole – Dipole interaction
Which compound is used as the cooling liquid in refrigerators?
  1. Phosphine
  2. Ammonia
  3. Ozone
  4. Nitrous oxide
The maximum covalency of nitrogen is
  1. Eight
  2. Five
  3. Four
  4. Six
Which among the following forms basic oxide?
  1. Phosphorous
  2. Nitrogen
  3. Bismuth
  4. Antimony
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