For the reaction $PCl_{5(g)} \rightleftharpoons PCl_{3(g)} + Cl_{2(g)}$,the forward reaction at constant temperature is favoured by

Which reaction is not affected by a change in pressure?

In which of the following reactions does the yield of the product not increase by the application of high pressure?

Dihydrogen gas is obtained from natural gas by partial oxidation with steam as per the following endothermic reaction:
$CH_{4(g)} + H_2O_{(g)} \rightleftharpoons CO_{(g)} + 3H_{2(g)}$
$(a)$ Write an expression for $K_p$ for the above reaction.
$(b)$ How will the values of $K_p$ and the composition of the equilibrium mixture be affected by:
$(i)$ increasing the pressure
$(ii)$ increasing the temperature
$(iii)$ using a catalyst?

The colour of $CrO_4^{2-}(aq.)$ is not changed by:

Consider the following reaction for which the change in enthalpy is positive:
$2 A_{(g)} + B_{(g)} \rightleftharpoons C_{(g)} + D_{(g)}$
Which of the following will not affect the equilibrium?