In a vessel containing $SO_3$,$SO_2$,and $O_2$ at equilibrium,some helium gas is introduced so that the total pressure increases while temperature and volume remain constant. According to Le Chatelier's principle,the dissociation of $SO_3$:

For the reaction $aA \rightleftharpoons lL + mM$,if the volume is suddenly increased,the degree of dissociation decreases. What does this indicate?

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

Given reaction is $2 X_{(g)} + Y_{(g)} \rightleftharpoons 2 Z_{(g)} + 80 \ kcal$. Which combination of pressure and temperature gives the highest yield of $Z$ at equilibrium?

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

$N_2 + O_2 \rightleftharpoons 2NO - Q \, cal$. In the above reaction,which is the essential condition for the higher production of $NO$?