question_answer

The electrolytes usually used in the electroplating   of gold and silver, respectively are: [JEE Main Online Paper (Held On 10-Jan-2019 Evening]

A) \[{{\left[ Au{{\left( CN \right)}_{2}} \right]}^{-}}and\text{ }{{\left[ Ag{{\left( CN \right)}_{2}} \right]}^{-}}\]

B) \[{{\left[ Au{{\left( CN \right)}_{2}} \right]}^{-}}and\text{ }{{\left[ Ag{{\left( Cl \right)}_{2}} \right]}^{-}}\]

C) \[{{\left[ Au{{\left( OH \right)}_{4}} \right]}^{-}}and\text{ }{{\left[ Ag{{\left( OH \right)}_{2}} \right]}^{-}}\]

D) \[{{[Au{{(N{{H}_{3}})}_{2}}]}^{+}}\,and\,\,{{[Ag{{(CN)}_{2}}]}^{-}}\]