Which of the following chemical reactions correctly occur in the combustion tube during the estimati — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

In Dumas' method, Cupric oxide ($CuO$) is the primary oxidizing agent. It oxidizes Carbon to $CO_2$ and Hydrogen to $H_2O$. Any oxides of nitrogen inadvertently formed are reduced back to $N_2$ by the hot copper gauze. Nitrogen does not form stable $Cu(NO_3)_2$ under these conditions.