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

Consider the following reaction:
$N_{2}O_{4(g)} \rightleftharpoons 2NO_{2(g)} ; \Delta H^{0} = +58 \ kJ$
For each of the following cases $(a, b)$,determine the direction in which the equilibrium shifts:
$(a)$ Temperature is decreased
$(b)$ Pressure is increased by adding $N_{2}$ at constant $T$ and constant $V$

The equilibrium $SO_2Cl_{2(g)} \rightleftharpoons SO_{2(g)} + Cl_{2(g)}$ is attained at $25 \ ^oC$ in a closed container and inert gas helium is introduced at constant volume. Which of the following statements are not correct?
$(a)$ Concentrations of $SO_2, Cl_2$ and $SO_2Cl_2$ change
$(b)$ More chlorine is formed
$(c)$ Concentration of $SO_2$ is reduced
$(d)$ More $SO_2Cl_2$ is formed

For the reversible reaction,
$N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)} + \text{heat}$
The equilibrium shifts in the forward direction:

In the reaction,$A_{2(g)} + 4B_{2(g)} \rightleftharpoons 2AB_{4(g)}$,$\Delta H < 0$,the formation of $AB_{4}$ is favoured at

Based on Le Chatelier's principle,which of the following information is obtained?