1 Removing O2
Increased! If oxygen is removed, the equilibrium shifts toward the reactants, producing more ammonia.
2 Adding N2
Increased! If more nitrogen gas is added it shifts the equilibrium towards the reactants again, causing more ammonia to build up.
3 Adding H2O
Increased! Same effect as for adding N2, addition of more products causes the shift towards the reactants.
4 Decreasing the pressure
Decreased! We have 7 mol of reactants vs 8 mol of products, so the products cause higher pressure in the system. If we decrease the pressure, system counteracts to the change producing more products, and reducing amount of ammonia.
5 Increasing the temperature
Increased! Heat is produced in this reaction (exothermic reaction). So additional temperature rise shifts the equilibrium towards the reactants, thus more ammonia is produced.