Correct statement among the following is 

  Option  2…CO is not inert gas because it  reacts with the product chlorine to form ${\mathrm{COCl}}_2$ . A  new  equilibrium is established .

Option 4: ${\mathrm{NH}}_4{\mathrm{COONH}}_{2\left(\mathrm{s}\right)}\rightleftharpoons 2{\mathrm{NH}}_{3\left(\mathrm{g}\right)}+{\mathrm{CO}}_{2\left(\mathrm{g}\right)}$ ; Different physical states….Heterogeneous;

Option 1,3 ….Equilibrium is attained quickly in presence of catalyst; Catalyst does not influence Equilibrium state or Equilibrium constant;