Class XII

Which compound is used in the preparation of caprolactam?
  1. Nitric acid
  2. Phosphorous halide
  3. Ammonia
  4. Phosphine
Ammonia act as a Lewis base because nitrogen has
  1. Lone pair of electrons
  2. 3 electrons in the outermost shell
  3. None of these
  4. Bond pair of electrons
Which among the following forms basic oxide?
  1. Phosphorous
  2. Nitrogen
  3. Bismuth
  4. Antimony
Which allotrope of phosphorous is most stable?
  1. White
  2. Red
  3. Black
  4. Blue
In laboratory ammonia is prepared by heating
  1. Nitrogen and hydrogen
  2. Calcium cyanamide with water
  3. Ammonium chloride with sodium hydroxide
  4. Ammonium chloride with calcium hydroxide
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