A mixture of Na2CO3 and Na2SO3 is treated with dilute H2SO4 in a setup such that the gaseous mixture emerging can pass first through a solution of BaCl2 and then gases mixture passed through acidified

Question

A mixture of Na2CO3 and Na2SO3 is treated with dilute H2SO4 in a setup such that the gaseous mixture emerging can pass first through a solution of BaCl2 and then gases mixture passed through acidified K2Cr2O7. Which of the following will you observe?

Prashant Kotian · Accepted Answer

Correct answer: B. Evolving gases are CO2 and SO2. Neither reacts with acidic/neutral BaCl2 solution (BaCO3 and BaSO3 are soluble in acids), so BaCl2 remains unaffected. SO2 gas will turn acidified K2Cr2O7 solution green due to reduction of Cr(VI) to Cr(III). Wait, the official key specifies Option A (my options order might differ, correct is 'The BaCl2 solution remains unaffected and the acidified dichromate solution turns green'). Wait, looking at Option A text in my table: "The BaCl2 solution remains unaffected... turns green". Yes, this matches.

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