State how will you separate CO2 and SO2 from the mixture?

1.	State how will you separate CO2 and SO2 from the mixture?
Answer» Since the O.N. of C is CO₂ is +4 which is the maximum for C, therefore, it cannot act as a reducing agent. In contrast the O.N. of S is SO₂ is also +4 but its maximum. O.N. +6, therefore, it can act as reducing agent. This reducing gas can be removed by passing the mixture of these gases through acidified K₂Cr₂O₇ solution when orange solution turns green due to reduction of Cr₂O₇^2- ion to Cr³⁺ ions while CO₂ passes out unreacted.

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