Which of the following conditions is favourable for the production of ammonia by Haber's process?

In the equilibrium reaction
$AgCl_{(s)} + 2NH_3(aq.) \rightleftharpoons [Ag(NH_3)_2]^+ (aq.) + Cl^{-} (aq.)$
Increase in the concentration of $Cl^{-} (aq.)$ causes

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.

Which of the following can be explained by Le Chatelier's principle?

Le Chatelier's principle is applicable to:

The equilibrium which remains unaffected by a change in pressure is: