How is the presence of SO_2 detected? – InterviewSolution

1.	How is the presence of SO_2 detected?
Answer» SOLUTION :`SO_2` TURNS acidified potassium dichromate solution green. 'It is due to the reduction of orange coloured dichromate ions to green `Cr^3+)` ions, The TEST can also' be performed by keeping a filter PAPER dipped in acidified potassium dichromate in the gas.

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