SATHEE: Extraction of Metals - Result Question 14

Extraction of Metals - Result Question 14

####14. The electrolytes usually used in the electroplating of gold and silver, respectively, are

(a) ${[A u (O H)_{4}]}^{-}$ and ${[A g (O H)_{2}]}^{-}$

(2019 Main, 10 Jan II)

(b) ${[A u {(N H_{3})}_{2}]}^{+}$ and ${[A g (C N)_{2}]}^{-}$

(d) ${[A u (C N)_{2}]}^{-}$ and ${[A g C l_{2}]}^{-}$

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Solution:

Electroplating is a process of coating one metal or metal object with a very thin layer of another metal typically applying a direct electric current.

Electrolytes used in the electroplating of gold and silver are given in the table below:

	Process	Article to be plated out acts as cathode	Pure metal block acts an anode by which electroplating will be done	Electrolyte (aqueous solution)
(a)	Gold plating	Article	$A u (s)$	$I$ $N a [A u (C N)_{2}]$ (Sodium auro-cyanide)
(b)	Silver plating	Article	$Ag (s)$	$I$ $N a [A g (C N)_{2}]$ (Sodium argento cyanide)

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Extraction of Metals - Result Question 14

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