Class XII

Which among the following forms basic oxide?
  1. Phosphorous
  2. Nitrogen
  3. Bismuth
  4. Antimony
The most abundant oxidation states of nitrogen are
  1. – 3, +5
  2. – 3, +3
  3. – 3, +3, +5
  4. +3, +5
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 allotrope of phosphorous is most stable?
  1. White
  2. Red
  3. Black
  4. Blue
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