In the process of extraction of gold,
1.) Roasted Au ore $+ C N_{(a q)}^{-} + O_{2} ⟶ [X] + N a O H$
2.) $[X] + Z n ⟶ [Y] + A u$

X = [A u (C N)_{2}]^{-}, Y = [Z n (C N)_{4}]^{2 -}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

X = [A u (C N)_{4}]^{2 -}, Y = [Z n (C N)_{4}]^{2 -}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

X = [A u (C N)_{2}]^{-}, Y = [Z n (C N)_{6}]^{4 -}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

X = [A u (C N)_{4}]^{-}, Y = [Z n (C N)_{4}]^{2 -}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $X = [A u (C N)_{2}]^{-}, Y = [Z n (C N)_{4}]^{2 -}$
This reaction is an example of the Cyanide process (Mac Arthur Forrest Process) for extraction of metals like gold or silver.

Reaction:

$A u + 8 N a C N + 2 H_{2} O + O_{2} \to 4 N a [A u (C N)_{2}] + 4 N a O H$

Gold is obtained by reaction with Zn:

$2 N a [A u (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A u$

Therefore, $X = [A u (C N)_{2}]^{-}$ and $Y = [Z n (C N)_{4}]^{2 -}$

Suggest Corrections

Similar questions

R o a s t e d g o l d o r e + C N^{-} + H_{2} O_{2} [X] + O H^{-}

[X] + Z n ⟶ [Y] + A u

roasted gold ore + C N^{-} + H_{2} O O_{2} - \to [X] + O H^{-}

[X] + Z n \to [Y] + A u

[X]

[Y]

+ C N_{(a q)}^{-} + H_{2} O_{2} [X] + [O H^{-}]

[X] + Z n \to [Y] + A u

R o a s t e d g o l d o r e + C N^{-} + H_{2} O_{2} [X] + O H^{-}

[X] + Z n ⟶ [Y] + A u

4 A u + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4 [A u (C N)_{2}]^{-} + 4 O H^{-}

2 [A u (C N)_{2}]^{-} + Z n \to 2 A u + [Z n (C N)_{4}]^{2 -}

Join BYJU'S Learning Program