Class XII

The most abundant oxidation states of nitrogen are
  1. – 3, +5
  2. – 3, +3
  3. – 3, +3, +5
  4. +3, +5
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 compound is used in the preparation of caprolactam?
  1. Nitric acid
  2. Phosphorous halide
  3. Ammonia
  4. Phosphine
Which allotrope of phosphorous is most stable?
  1. White
  2. Red
  3. Black
  4. Blue
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