What are the strict reaction conditions and the visual confirmation generated by the classical Chrom — d and f Block Elements Chemistry Question

💡 Solution & Explanation

The test strictly requires concentrated $H_2SO_4$ to dehydrate the mixture. The reaction generates deep orange-red fumes of Chromyl Chloride ($CrO_2Cl_2$). Covalent chlorides fail this test as they do not readily release $Cl^-$ ions.