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A hydrated metallic salt A, light green in colour , on careful heating gives a white anhydrous residue B. B is soluble in water and its aqueous solution reacts with NO to give a dark brown compound C, B on strong heating gives a brown residue D and a mixture of two gases E and F. The gaseous mixture when passed through acidified permanganate, discharges the pink colour and when passed through acidified BaCl2 solution gave a white precipitate, Identify A, B, C D, E and F.

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Acidified potassium permanganate is decolourised with SO2 and SO3.

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