Effect of Concentration, Pressure and Temperature — MCQ Practice

Consider the reversible reaction: $2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$, $\Delta H = -198\,\text{kJ}$. Which of the following conditions will favor the maximum production of $SO_3$?

For the reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$, what is the effect of adding an inert gas like Argon (Ar) at constant volume on the equilibrium position?

Consider the reaction: $A(s) + B(g) \rightleftharpoons C(g) + D(g)$. If the pressure of the system is increased by decreasing the volume, what will be the effect on the equilibrium?

For the reaction $CO(g) + 2H_2(g) \rightleftharpoons CH_3OH(g)$, $\Delta H = -90.7\,\text{kJ/mol}$. If the temperature of the system is increased, what will be the effect on the concentration of $CH_3OH(g)$?

For the equilibrium $Fe^{3+}(aq) + SCN^{-}(aq) \rightleftharpoons [Fe(SCN)]^{2+}(aq)$ (colorless) (colorless) (red), what will be observed if a few drops of $KCl(aq)$ are added to the system?

For the reaction $H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$, $\Delta H > 0$. Which of the following statements is INCORRECT?