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QJEEAdv19Chc054: JEE Advanced 2019 Chemistry - Class 12 JEEAdv19Chc054 Solution: The cyanide process of gold extraction involves leaching out…

The cyanide process of gold extraction involves leaching out gold from its ore with CN −- in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s).

Multiple Choice Options

  • A Q is O2
  • B Z is [Zn(CN)4]2 −-
  • C T is Zn
  • D R is [Au(CN)4] −-

Step-by-Step Verified Solution

Cyanide process of gold extraction involves leaching out gold from its ore with CN- in the presence of O2 (Q) in water to form [Au(CN)2]- (R). When [Au(CN)2]- reacts with Zn (T), it forms [Zn(CN)4]2- (Z) and Au.

The corresponding reactions are as follows :

JEE Advanced 2019 Paper 2 Offline Chemistry - Isolation of Elements Question 13 English Explanation
Hence, options (a, b, c) are correct.

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