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Match the following
              List – I                   List – II
          A – CFCs            I. secondary pollutant
          B – $C H_{4}$                II. Refrigerators
          C – $S O_{2}$               III. Primary pollutants
          D – PAN              IV. Cattle, rice fields
     The correct order A      B      C      D

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II IV III I

I II IV III

IV I II III

II I III IV

answer is C.

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Detailed Solution

CFCs-used in refrigerators

$C H_{4}$ produced by rice fields cattle

$S O_{2}$ –primary pollutant

PAN – secondary pollutant

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Match the following List – I List – II A – CFCs I. secondary pollutant B – CH4 II. Refrigerators C – SO2 III. Primary pollutants D – PAN IV. Cattle, rice fields The correct order A B C D