A scarlet compound A is treated with cone. `HNO_3` to give a chocolate brown precipitate `B`. The precipitate is filter

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Q 2617356280.     A scarlet compound A is treated with cone. `HNO_3` to give a chocolate brown precipitate `B`. The precipitate is filtered and the filtrate is neutralised with `NaOH`. Addition of `KI` to the resulting solution gives a yellow ppl `C`. The brown ppt `B` on warming with cone. `HNO_3` in the presence of `Mn(NO_3)_2` produces a pink coloured solution due to the formation of D. Identify A. B, C and D. Write the reaction sequence.
JEE 1995

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