$2x_{(g)} + y_{(g)} \rightleftarrows 2z_{(g)} + 80 \ kcal$
Which combination gives the highest yield of $z$ at equilibrium?

What is the optimum temperature maintained in the Haber process for the production of ammonia (in $K$)?

In a vessel,the following two systems are in simultaneous equilibrium: $PCl_{5(g)} \rightleftharpoons PCl_{3(g)} + Cl_{2(g)}$ and $COCl_{2(g)} \rightleftharpoons CO_{(g)} + Cl_{2(g)}$. If some $CO$ is added to the vessel at constant volume,then at the new equilibrium:

The role of a catalyst in a reversible reaction is to

The equilibrium $SO_2Cl_{2(g)} \rightleftharpoons SO_{2(g)} + Cl_{2(g)}$ is attained in a closed vessel at $25 \, ^\circ C$. If an inert gas,$He$,is added at constant volume,which of the following statement$(s)$ is/are correct?

At $25\,^oC$,the equilibrium $SO_2Cl_2(g) \rightleftharpoons SO_2(g) + Cl_2(g)$ is established in a closed vessel. When $Cl_2$ is added to the equilibrium mixture,which of the following statements is/are correct for the system?
$(1)$ Change in concentrations of $SO_2$,$Cl_2$,and $SO_2Cl_2$.
$(2)$ More $Cl_2$ is produced.
$(3)$ The concentration of $SO_2$ decreases and the concentration of $SO_2Cl_2$ increases.