What are the reactions involved in removing ${{SO}_{2}}$

CBSE Class 11 CBSE Class 11 Chemistry
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(i) What are the reactions involved in removing ${{SO}_{2}}$ from the atmosphere by passing it through a solution containing citrate ions?.
(ii) What is the most important sink of CO pollutant?
(iii) How are flue gases from industries freed from oxides of nitrogen and sulphur?

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(ii) Soil microorganisms
(iii) By scrubbing them with cone. H_{2}SO_{4} or with alkaline solutions like Ca${{(OH)}{2}} and Mg{{(OH)}{2}}$.