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What are reactions involved in removing ...

What are reactions involved in removing `SO_(2)` from the atmosphere by passing it through a solution containing citrate ions ?

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`SO_(2) + H_(2)O hArr HSO_(3)^(-) + H^(+)`
`HSO_(3)^(-) + H_(2)cit^(-) underset("complex")to (HSO_(3).H_(2)cit)^(2-)`
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