Le Chatelier's principle is applicable only to a

Which of the following conditions is favorable for the forward reaction in the equilibrium: $H_2 \rightleftharpoons H + H$ $(\Delta H = +ve)$?

For the equilibrium system $CO_{2(s)} \rightleftharpoons CO_{2(g)}$,$\Delta H = +ve$,what happens if the temperature is decreased?

The reaction $A + B \rightleftharpoons C + D + \text{heat}$ has reached equilibrium. The reaction may be made to proceed forward by:

In what manner will an increase of pressure affect the following equilibrium equation?
$C_{(s)} + H_2O_{(g)} \rightleftharpoons CO_{(g)} + H_{2(g)}$

At $25 \ ^oC$,the reaction $SO_2Cl_2(g) \rightleftharpoons SO_2(g) + Cl_2(g)$ is in equilibrium in a closed vessel. If an inert gas,$He$,is added to this system at constant volume,which of the following statements is true?