Question

In the Haber process for the industrial manufacture of ammonia involving the reaction, $N_2+3H_2\rightleftharpoons 2N{H}_3$ at 200 atm pressure in the presence of a catalyst, a temperature of about 500${}^o$C is used. This is considered as optimum temperature for the process because _______.

• A. yield is maximum at this temperature
• B. catalyst is active only at this temperature
• C. energy needed for the reaction is easily obtained
• D. the rate of the catalytic reaction is fast enough while the yield is also appreciable for this exothermic reaction at this temperature

Answer 1

The correct option is D the rate of the catalytic reaction is fast enough while the yield is also appreciable for this exothermic reaction at this temperature

Formation of ammonia is an exothermix process therefore it is favourable at lower temperature. But at lower temperature rate of the reaction becomes slow.