Question

In Dumas method for the estimation of $N _2$, the sample is heated with copper oxide and the gas evolved is passed over :

• A. Copper gauze
• B. $Pd$
• C. $Ni$
• D. Copper oxide

Answer 1

Answer: (A)

Copper gauze

Answer 2

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 H2​O.
Cx​Hy​Nz​+(2x+2y​)CuO→
xCO2​+2y​H2​O+2z​N2​+(2x+2y​)Cu
Traces of nitrogen oxides formed, if any, are reduced to nitrogen by passing the gaseous mixture over heated copper gauze.
So, the correct option is (A) : Copper gauze