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How is the presence of SO2 detected ?...

How is the presence of `SO_2` detected ?

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A paper dipped in acidified potassium dichromate solution turns green when a `SO_2` gas is allowed to pass through it.
`underset("orange")(K_(2)Cr_(2)O_(7)) + H_(2)SO_(4) + 3SO_(2) to K_(2)SO_(4) + underset("green")(Cr_(2)(SO_(4))_(3) + H_(2)O`
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