See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Radicals: 2 4 4 NH ,Cl ,Fe ,SO     Blue colour is Fe3[Fe(CN)6]2 in which Fe(II) and Fe(III) are present. BaSO4 is soluble in conc. H2SO4 as it forms   4 2 Ba HSO . Red vapours formation is due to Clin chromyl chloride SECTION – B