If pressure is applied to the equilibrium of liquid $\rightleftharpoons$ vapour,the boiling point of liquid:-

Select the correct statement from the following:

In which of the following equilibrium reactions does the equilibrium shift to the right when the total pressure is decreased?

In the reaction,$A_{2(g)} + 4B_{2(g)} \rightleftharpoons 2AB_{4(g)}$,$\Delta H < 0$,the formation of $AB_{4}$ is favoured at

$KMnO_4$ can be prepared from $K_2MnO_4$ as per the reaction:
$3MnO_4^{2-} + 2H_2O \rightleftharpoons 2MnO_4^- + MnO_2 + 4OH^-$
The reaction can go to completion by removing $OH^-$ ions by adding:

Le Chatelier's principle is applicable to which of the following?