Class XII

Elements having +5 oxidation state is
  1. Arsenic
  2. Phosphorous
  3. Antimony
  4. Bismuth
Which compound is used as the cooling liquid in refrigerators?
  1. Phosphine
  2. Ammonia
  3. Ozone
  4. Nitrous oxide
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 compound is used in the preparation of caprolactam?
  1. Nitric acid
  2. Phosphorous halide
  3. Ammonia
  4. Phosphine
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