For the gaseous reaction, C 2 H 4 + H 2 ⇌ C 2 H 6 , ∆ H = - 130 k J m o l - 1 carried in a closed vessel, the equilibrium concentration of the C 2 H 6 can definitely be increased by

Step-by-step solution

According to Le-Chatelier's principle exothermic reactions are favourable at low pressure. The reaction in which number of moles decreases are favourable at high pressure or low volume. C 2 H 4 + H 2 ⇌ C 2 H 6 , ∆ H = - 130 k J m o l - 1 ∵ The reaction is exothermic and number of moles of reactants are decreasing. ∵ The reaction rate is increased by decreasing temperature and increasing pressure.