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  • An aqueous blue coloured solution of a transition metal sulphate reacts with H2S to give a black precipitate. The black precipitate dissolves in <img alt="50\:^{o}/_{o}" src="https://entrancecorner

An aqueous blue coloured solution of a transition metal sulphate reacts with H2S to give a black precipitate. The black precipitate dissolves in 50\:^{o}/_{o}  nitric acid forming a blue coloured solution. The blue solution on treatment with KI in weakly acidic medium turns yellow/brown and produces a white precipitate. Identify the transition metal ion from the following ions ?

Option: 1

Co^{+2}


Option: 2

Cu^{+2}


Option: 3

Hg^{+2}


Option: 4

Pb^{+2}


Answers (1)

best_answer

CuSO_{4}+H_{2}S\rightarrow CuS  (black)+H_{2}SO_{4}

CuS+2HNO_{3}\rightarrow Cu(NO_{3})_{2}(blue\:solution)+NO+S+H_{2}O

2Cu^{2+}+4I^{-}\rightarrow Cu_{2}I_{2} (white)+I_{2}

(colour of solution is yellow/brown)

 

Posted by

Shailly goel

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