Class XII

Ammonia is used in detection of
  1. Sodium ion
  2. Magnesium ion
  3. Potassium ion
  4. Copper ion
Which of the following oxides reacts with both HCl and NaOH?
  1. ZnO
  2. N2O5
  3. CO2
  4. CaO
Xenondifluoride is
  1. Trigonal
  2. Angular
  3. Pyramidal
  4. Linear
Ozone can be detected by using
  1. Sodium
  2. None of these
  3. Silver
  4. Mercury
Which is used to produce smoke screens?
  1. Calcium phosphide
  2. Sodium carbonate
  3. Zinc phosphide
  4. Zinc sulphide
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