39wat r u going to do even if u know the options? it can be answered only if u know the reactions.
and once u know the reactions , u dont need the options.
an aqueous blue coloured solution of a transition metal sulphate reacts with H2S in acidic medium to give a black precipiate (A) which is insoluble in warm aqeous solution of KOH. the blue solution on treatment eit KI in weakly acidic medium turns yellow and produces a white recipitate B.identfy the transition metal ion and write the equations involved in formation of A and B.
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