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The gas liberated, on heating a mixture of two salts with NaOH, gives a reddish brown precipitate with an alkaline solution of K2HgI4. The aqueous solution of the mixture on treatment with BaCl2 gives a white precipitate which is sparingly soluble in conc. HCl. On heating the mixture with K2C2O7 and conc. H2SO4, red vapours 'A' are produced. The aqueous solution of the mixture gives a deep blue colouration 'B' with potassium ferricyanide solution. Identify the radicals in the given mixture and write the balanced equations for the formation of A and B.

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Formation of a reddish brown ppt. with alkaline K2HgI4 solution indicates the presence of radical ammonium NH+4 and the gas liberated in ammonia. The reactions are as

On treatment with BaCl2, a white ppt. is formed which indicates the presence of sulphate anion (SO2-4 ) sparingly soluble in conc. HCl.

With K2Cr2O7 and conc. H2SO4 red vapours are evolved which indicates the presence of chloride ion (Cl-). The reaction is as

On treatment with potassium ferricyanide indicates the presence of ferrous ions.

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