For the reaction, `N_2(g)+3H_2(g)hArr2NH_3(g)`+heat the equilibrium shifts in forward direction-

Options

A. By increasing the concentration of `NH_3(g)`
B. By increasing pressure and decreasing temperature
C. by decreasing the concentration of `N_2(g)` and `H_2(g)`
D. By decreasing the pressure

Explanation

The reaction is exothermic and it is associated with decrease in volume. So, according to Le Chatelier's principle, increase in pressure at constant temperature or decrease in temperature will make the equilibrium shift to the right.