In the estimation of carbon and hydrogen by Liebig's method, if the organic compound also contains n — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

When interfering elements are present in Liebig's test, their oxides would artificially inflate the $CO_2$ and $H_2O$ measurements. A copper gauze reduces nitrogen oxides to $N_2$ (which is not absorbed). Silver gauze traps halogens as $AgX$, and fused lead chromate traps sulphur oxides as $PbSO_4$.