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JEE Main 2022 Chemistry question

ChemistryGeneral Principles and Processes of Isolation of Elements (Metallurgy)JEE Main 2022

Not in JEE Main or NEET syllabus

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :

Answer: (3)

Solution

8CN^{-}2H_{2}OO_{2}4[Au(CN)_{2}]^{-}4OH^{-}$ (A =

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Question ID VK-024957