MHT CET 2021 Chemistry Solved Paper

SO2 turns lime water milky.
SO2 in aqueous solution gives H2SO3.
H2SO3⇌H++HSO3−
CO2 also turns lime water milky.
CO2 in aqueous solution gives H2CO3.
H2CO3⇌H++HCO3−
H2SO3 is stronger acid than H2CO3. Thus, ionisation of H2SO3 is larger than H2CO3. Thus, pH of H2SO3 is lower than that of H2SO2.