Which of the following statements is/are correct regarding the microcosmic salt bead test? — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Microcosmic salt ($Na(NH_4)HPO_4 \cdot 4H_2O$) decomposes on heating to yield $NaPO_3$ (sodium metaphosphate), $NH_3$, and $H_2O$. The transparent $NaPO_3$ bead reacts with metallic oxides like $CuO$ to form colored orthophosphates (e.g., $NaCuPO_4$, which is blue). All statements are correct.