The electrolytes usually used in the electroplating

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Question:
The electrolytes usually used in the electroplating of gold and silver, respectively, are :

$\left[\mathrm{Au}(\mathrm{OH})_{4}\right]^{-}$and $\left[\mathrm{Ag}(\mathrm{OH})_{2}\right]^{-}$
$\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}$and $[\mathrm{Ag} \mathrm{CI}]^{-}$
$\left[\mathrm{Au}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}$and $\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-}$
$\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}$and $\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-}$

Correct Option: , 4

Solution:

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