The role of a catalyst in a reversible reaction is to

For which of the following reactions is product formation favoured at low pressure and low temperature?

The reaction between thiocyanate ion and ferric ion is given below. If $SCN^-$ ions are added to the equilibrium mixture,what will happen? $SCN^-_{(aq)} (\text{colorless}) + Fe^{3+}_{(aq)} (\text{yellow}) \rightleftharpoons [Fe(SCN)]^{2+} (\text{deep red})$

Explain the effect of temperature change on chemical equilibrium with an example.

The exothermic formation of $ClF_3$ is represented by the equation $Cl_{2(g)} + 3F_{2(g)} \rightleftharpoons 2ClF_{3(g)}$; $\Delta H = -329 \ kJ$. Which of the following will increase the quantity of $ClF_3$ in an equilibrium mixture of $Cl_2, F_2$ and $ClF_3$?

The formation of nitric oxide by the reaction $N_2 + O_2 \rightleftharpoons 2NO$ with $\Delta H = +43.200 \ kcal$ is favoured by: