Question

In Dumas method for the estimation of N₂ , the sample is heated with copper oxide and the gas evolved is passed over 

(1) Ni 

(2) Copper gauze 

(3) Pd 

(4) Copper oxide

Answer 1

(2) Copper gauze

Duma’s method. 

The nitrogen containing organic compound, when heated with CuO in a atmosphere of CO₂, yields free N₂ in addition to CO₂ and H₂O.

Traces of nitrogen oxides formed, if any, are reduced to nitrogen by passing the gaseous mixture over heated copper gauze.