`{:("Column" (I) , "Column"(II)), ((a) "Presence of halogen" , P. HNO_(3)//AgNO_(3)), ((b) "Presence of sulphur" , Q. Na_(2)[Fe(CN)_(5)NO]) , ((c) "Presence of nitrogen" , R. Co(NO_(3))_(2)), ((d) "Presence of" P "and" S , S. FeCl_(3)):}`

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Correct Answer - (a) `to P " " (b) to Q ; " " (c) to S ; " " (d) to R `

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