1.

State the conditions required for the following reaction to take place : (i) Catalytic hydrogenation of ethyne. (ii) Preparation of ethyne from ethylene dibromide. (iii) Catalytic oxidiation of ammonia to nitric oxide.(iv) Any two conditions for the conversion of sulphur dioxide to sulphur trioxide.

Answer»

(i) In the presence of catalyst like finely divided nickel, platinum, heating upto 473 K. 

(ii) Hot and concentrated alcoholic solution of potassium hydroxide. 

(iii) Platinum gauze catalyst at 800C in presence of oxygen. 

(iv) Vanadium pentoxide as catalyst and temperature 450oC / 2 atm. pressure.



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