Question:

2[Au(CN)2] + Zn \(\to\) [Zn(CN)4]2– + 2Au\(\downarrow\) is which of these 
(A) Redox reaction 
(B) Displacement reaction
(C) Combination reaction
(D) Decomposition reaction 

Updated On: Mar 21, 2025
  • A & B
  • B only
  • A & D
  • B & D
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The Correct Option is A

Solution and Explanation

The correct answer is A & B:

\[ 2[\text{Au(CN)}_2]^– + \text{Zn} \to [\text{Zn(CN)}_4]^{2–} + 2\text{Au} \] 

This reaction involves the reduction of gold (\(Au\)) and the oxidation of zinc (\(Zn\)), making it a:

  • Redox reaction: Gold is reduced, and zinc is oxidized.
  • Displacement reaction: Zinc displaces gold from its complex.
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General Principles and Processes of Isolation of Elements

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Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.

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Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –

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