Complete the blanksa] to to e] in the passage given , using the following words .[Ammonium ,reddish brown,hydroxyl,nitrogen dioxide ,ammonia ,dirty green alkaline , acidic].In the presence of a catalyst , nitrogen & hydrogen combine to give a] ______ gas. When the same gasispassed through water ,it formsa soln ,which will be b]______ in nature & will contain the ions c ]____& d]____.e]A ____ coloured ppt . of iron [II] hydroxide is formed when the above soln is added to iron [II] sulphate soln.