On increasing temperature,the equilibrium constant of exothermic and endothermic reactions,respectively

In which of the following equilibrium reactions,the equilibrium would shift to the right,if total pressure is increased?

Aqueous solution of ferric nitrate when mixed with aqueous solution of potassium thiocyanate gives a red coloured solution. The intensity of the red colour becomes constant upon attaining equilibrium. Choose the correct statement when the following chemicals are added to the above solution at equilibrium:
$I$. Oxalic acid
$II$. Mercuric chloride

In which of the following reactions will a change in pressure not affect the rate of reaction?

For the formation of $NH_{3(g)}$ from its constituent elements,the favourable conditions for its formation are

Consider the following reversible reaction at equilibrium,$2H_2O_{(g)} \rightleftharpoons 2H_{2(g)} + O_{2(g)}$; $\Delta H = 241.7 \ kJ$. Which one of the following changes in conditions will lead to maximum decomposition of $H_2O_{(g)}$?