For the reaction $SO_{2(g)} + 1/2 O_{2(g)} \rightleftharpoons SO_{3(g)}$,the percentage yield of product at different pressures is shown in the figure. Then,which among the following is true?

What happens when an inert gas is added to an equilibrium system while keeping the volume unchanged?

When a sample of $NO_2$ is placed in a container,this equilibrium is rapidly established: $2NO_{2(g)} \rightleftharpoons N_2O_{4(g)}$. If this equilibrium mixture is a darker colour at high temperatures and at low pressure,which of these statements about the reaction is true?

Consider the heterogeneous equilibrium in a closed container:
$NH_4HS_{(s)} \rightleftharpoons NH_{3(g)} + H_2S_{(g)}$
If more $NH_4HS_{(s)}$ is added to the equilibrium,what will be the effect on the system?

What is the effect of the reduction of the volume of the system for the equilibrium $2 C_{(s)} + O_{2(g)} \rightleftharpoons 2 CO_{(g)}$?

For the equilibrium $C_{(diamond)} \rightleftharpoons C_{(graphite)}$,the densities of diamond and graphite are $3.5 \ g/mL$ and $2.3 \ g/mL$ respectively. What happens to the equilibrium upon increasing the pressure?