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For a reversible reaction at a certain temperature when it is at equilibrium or equilibrium has been attained whether physical or chemical, a change in certain variables might change the state of equilibrium. These variables include pressure, volume, concentration and temperature. Due to these changes, a system under equilibrium changes its state in such a manner, i.e., the equilibrium moves in forward direction or backward direction, so that the effect of change is annuled. For a gaseous phase endothermic decomposition of phosphorus pentachloride, can be made spontaneous by increasing concentration of \( \mathrm{PCl}_{5} \), lowering the pressure and increasing temperature of the system.
Which of the following reactions proceed in forward direction with increase in temperature are?
(A) \( \mathrm{H}_{2}(g)+\mathrm{I}_{2}(g) \rightleftharpoons 2 \mathrm{HI}(g)+3000 \mathrm{cal} \)
(B) \( \mathrm{N}_{2}(g)+\mathrm{O}_{2}(g) \rightleftharpoons 2 \mathrm{NO}(g)-43200 \mathrm{cal} \)
(C) \( \mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(g) \rightleftharpoons 2 \mathrm{NH}_{3}(g)+22400 \mathrm{cal} \)
(D) \( \mathrm{C}(s)+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g})+94300 \mathrm{cal} \)
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