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  4. In Dumas method for the estimation of N 2, the sample is heated with copper oxide and the gas evolved is passed over :

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

JEE MainJEE Main 2023Organic Chemistry – Some Basic Principles and Techniques

Solution:

Duma's method.
The nitrogen containing organic compound, when heated with $CuO$ in a atmosphere of $CO _2$, yields free $N _2$ in addition to $CO _2$ and $H _2 O$.
$C _{ x } H _{ y } N _{ z }+\left(2 x +\frac{ y }{2}\right) CuO \rightarrow$
$ x CO _2+\frac{ y }{2} H _2 O +\frac{ z }{2} N _2+\left(2 x +\frac{ y }{2}\right) Cu$
Traces of nitrogen oxides formed, if any, are reduced to nitrogen by passing the gaseous mixture over heated copper gauze.