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  • In Dumas method for the estimation of N2, the sample is heated with copper oxide and the gas evolved is passed over :  Option: 1 Copper o

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

Option: 1

Copper oxide


Option: 2

Ni


Option: 3

Pd

 


Option: 4

Copper gauze


Answers (1)

best_answer

Duma’s method. The nitrogen containing organic compound, when heated with \mathrm{CuO} in a atmosphere
of \mathrm{CO_{2}}, yields free \mathrm{N_{2}} in addition to \mathrm{CO_{2}} and \mathrm{H_{2}O}.

\mathrm{C}_{\mathrm{x}} \mathrm{H}_{\mathrm{y}} \mathrm{N}_{\mathrm{z}}+\left(2 \mathrm{x}+\frac{\mathrm{y}}{2}\right) \mathrm{CuO} \rightarrow

                                                       \mathrm{xCO}_2+\frac{\mathrm{y}}{2} \mathrm{H}_2 \mathrm{O}+\frac{\mathrm{z}}{2} \mathrm{~N}_2+\left(2 \mathrm{x}+\frac{\mathrm{y}}{2}\right) \mathrm{Cu}

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

Posted by

Pankaj Sanodiya

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