Redox Reactions And Electrochemistry Ques 354

Question: CuS is dissolved in dil. $ HNO_3 $ . Balanced equation with correct products is

Options:

A) $ CuS=2{{H}^{+}}=3N{{O}^{-}}_3\to Cu(NO_3+H_2S) $ $ +H_2O+NO_2 $

B) $ 3CuS=8{H^{+}}=8N{O^{-}}_3\to 3Cu{(NO_3)} _2+3S $ $ +4H_2O+2NO $

C) $ CuS+4N{{O}^{-}}_3\to Cu{{(NO_3)}_2}+H_2S+H_2O $

D) None of the above incorrect

Show Answer

Answer:

Correct Answer: B

Solution:

[b] $ CuS $ (Black ppt.) on boiling with $ HNO_3 $ results in the formation of colloidal S and blue coloured solution of $ Cu{{(NO_3)}_2} $ .



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