Gven below is the incomplete equation for the extraction process of gold using potassium cyanide. Identify the missing reagent?
$Roasted gold ore + C N^{─} + ? ? \to [A u (C N)_{2}]^{─} + O H^{─}$

Water

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Oxygen

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Water + air

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Zinc dust

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Solution

The correct option is C Water + air
Gold combines with cyanide in the presence of air and water to form $[Au(CN)_{2}]^{-}$ in aqueous solution. This is then treated with zinc dust to obtain gold in metallic form.
$Roasted gold ore + C N^{─} + H_{2} O O_{2} - \to [A u (C N)_{2}]^{─} + O H^{─}$

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