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

NEET UG 2017 · Chemistry · Question 90

NEET 2017 Chemistry, question 90

Question 90 of the NEET 2017 paper (code A) is a Chemistry question from General Principles and Processes of Isolation of Elements. Its idea, Leaching and Hydrometallurgy, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 4.

Updated 2026-10-08

Q90 · Chemistry

\mathrm{CN^-}

1 liquation 2 distillation 3 zone refining 4 displacement with Zn Official answer

Official answer: option 4 · CBSE official answer key

Same idea

The only question on Leaching and Hydrometallurgy

No other NEET paper from 2017–2026 tested this exact idea.

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The chapter

General Principles and Processes of Isolation of Elements in ten years of NEET

8 questions from 2017–2026, asked in 7 of 10 papers, about 0.8 a paper. General Principles of Metallurgy alone had 8.

Chapter analysis

The only question on Leaching and Hydrometallurgy

General Principles and Processes of Isolation of Elements in ten years of NEET

General Principles and Processes of Isolation of Elements: questions per paper