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Q 2657156084.     An aqueous blue coloured solution of a transition metal sulphate reacts with `H_2S` in acidic medium to give a black precipitate A, which is insoluble in warm aqueous solution of `KOH`. The blue solution on treatment with `KI` in weakly acidic medium, turns yellow and produces a white precipitate `B`. Identify the transition metal ion. Write the chemical reactions involved in the formation of' `A` and `B`.
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