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 annulled. A gaseous phase endothermic decomposition of phosphorus pentachloride, can be made spontaneous by increasing concentration of `PCl_5`, lowering the pressure and increasing temperature of the system.
Which of the following reactions proceed in forward direction with increase in temperature ?

Options

A. `H_2(g)+I_2(g) iff 2HI(g)+3000 cal`
B. `N_2(g)+O_2(g) iff 2N)(g)-43200 cal`
C. `N_2(g)+3H_2(g) iff 2NH_3(g)+22400 cal`
D. `C(s)+O_2(g) rarr CO_2(g)+94300 cal`

Answer

B