Ammonia is produced on large scale by Haber-Bosch process which involve the following reaction `N_2(g)+3H_2 hArr 2NH_3 + "Heat"`…(i) The condition used are 200 atmosphere pressure, `450^@ C` and a catalst "Pormoted Iron". Originally H2 required for the reaction was produced by electrolysis of water.This was expensive a cheaper method using coke and steam was then used.Now a days, the `H_2(g)` is produced from hydrocarbons `CH_4+2H_2O hArr CO_2 + 4H_2`...(ii) `CH_4+H_2O hArr CO+ 3H_2`...(iii) Some air is added the `O_2` burns with some `H_2` leaving behind `N_2(g)` to give the required ratio of `N_2:H_2=1:3` Answer the following questions based on the above information. Although the reaction is exothermic, it is being carried out at higher temperature beacauseA. it remove the volatile impurities.B. activate the catalystC. maintain a desirable rate of reaction.D. to have the less proportion of CO.