Question

1. Of the two gases, ammonia and hydrogen chloride, which is more dense? Name the method of collection of this gas.
2. Give one example of a reaction between the above two gases which produce a solid compound.
3. Write the balanced equation for a reaction in which ammonia is oxidized by:
   1. a metal oxide,
   2. a gas which is not oxygen.

Answer 1

1. Hydrogen chloride is collected by the upward displacement of air.
2. \[\ce{NH3 + HCl -> \underset{Ammonium chloride}{NH4Cl_{(s)}}}\]
3.   
   1. \[\ce{3CuO + 2NH3 ->[\Delta] 3Cu + N2 + 3H2O}\]
   2.  \[\ce{8NH3 + 3Cl2 -> N2 + 6NH4Cl}\]
      or \[\ce{2NH3 + 3Cl -> N2 + 6HCl}\]