Nitrating mixture is obtained by mixing conc. HNO3 and conc. H2SO4. Role of H2SO4 in nitration is: — p Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Peroxodisulfuric acid (H2S2O8, Marshall's acid) contains a peroxy (-O-O-) linkage between two sulfur atoms. Step 2: Partial/initial hydrolysis of one mole of H2S2O8 involves the cleavage of one S-O-O bond by water: H2S2O8 + H2O -> H2SO4 + H2SO5. Step 3: This reaction produces exactly one mole of sulfuric acid (H2SO4) and one mole of peroxomonosulfuric acid (H2SO5, Caro's acid). Thus, option (c) is the correct choice.