How many anions will give colourless acid vapour/ gas with conc. H2SO4 on reaction with following given anions ? CH3COO-, Cl-, Br-, S2-, SO3^2-, BO3^3-, NO2-, C2O4^2-, I-

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Prashant Kotian · Accepted Answer

Correct answer: 6. Step 1: Precipitation of anions depends on the solubility of their salts with various metal cations. Step 2: Most chlorides, sulfates, and carbonates form insoluble precipitates with several common metal cations (e.g., AgCl, BaSO4, CaCO3). Step 3: All common nitrate salts (NO3-) are highly soluble in water because of the low charge density and favorable hydration/lattice energy of the nitrate ion, making it very difficult to precipitate from aqueous solution. Thus, the correct option is (c).

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