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When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral FeCl 3 , it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains

1.  2 3 SO & CH 3 COO –
2. CH 3 COO – & NO 3 –
3.  2 3 SO &  2 4 2 O C
4.  2 4 2 O C &  3 NO

Correct answer: CH 3 COO – & NO 3 –

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