{:("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)):}

{:("Column" (I) , "Column"(II)), ((a) "Presence of halogen" , P. HNO_(

1.	{:("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)):}
Answer» <P> Answer :(a) `to P""(B) TOQ ; "" (c) to S ; "" (d) to R `