The electrolytes usually used in the electroplating

Question:

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

  1. $\left[\mathrm{Au}(\mathrm{OH})_{4}\right]^{-}$and $\left[\mathrm{Ag}(\mathrm{OH})_{2}\right]^{-}$

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

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

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


Correct Option: , 4

Solution:

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

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