Question

Nitrogen(IV) oxide is prepared by heating lead(ll) nitrate.

1. Write an equation for the reaction.
2. At room temperature, nitrogen(IV) oxide exists as an equilibrium mixture with dinitrogen tetraoxide.
      Δ is-ve
     (brown)          (pale yellow)
   State the observation made when the mixture is placed in an ice-bath. Give a reason. 

Answer 1

1. 2Pb(NO₃)₂(s)2PbO(s) + 4NO₂(g) + O₂(g)
2. Mixture turns yellow. yellow colour intensifies
   Decrease in temperature,forward is favoured /more N₂O₄ is formed since the reaction is exothermic