Topic: Transition elements: configuration, occurrence and characteristics· d- and f-Block Elements

Extraction of gold and silver involves leaching with CN^- ion. Silver is later recovered by :

1. distillation

2. zone refining

3. displacement with Zn

4. liquation

Doubtly Asked 30 Oct 2026 NEET UG 2017 neet Save WhatsApp Report

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Answer: 3. displacement with Zn

Key idea: Ag is recovered from the cyanide complex by a more electropositive metal.

\(2[Ag(CN)_2]^- + Zn \rightarrow [Zn(CN)_4]^{2-} + 2Ag\). This is displacement by zinc. Distillation suits low boiling metals (Zn, Hg); zone refining and liquation are purification methods.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Extraction of gold and silver involves leaching with CN^- ion. Silver is later recovered by :

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