N2(g)+3H2(g)⇌2NH3(g),∆H=−Q According to Le Chatelier's principle. • Exothermic reactions are favoured at low temperature. • Increase in pressure shifts the reaction in direction having lesser number of moles. Hence, the given reaction shifts forward on increasing pressure. • Increasing the concentration of reactants shifts the reaction in forward direction. So high concentration of H2 shifts reaction in forward direction.