JIPMER2017ChemistryGeneral Principles and Processes of Isolation of Metals

In cyamide extraction process of silver from argentite ore, the oxidising and reducing agents are respectively.

Options

AO ₂ and CO ₂
BO ₂ and Zn dust
CHNO ₃ and Zn dust
DHNO ₃ and CO

Correct answer

B. O ₂ and Zn dust

Step-by-step solution

The extraction of silver involves in cyanide process are (i) Ag ₂ ~S +2 CN ⁻+ O ₂ 2 [ Ag ( CN )₂ ]⁻+ SO ₂ (ii) [ Ag ( CN )₂ ]⁻+ Zn [ Zn ( CN )₄ ]²⁻+ Ag Thus, in (i) O ₂ -act as oxidising agent (oxidise sulphide to SO ₂ ) and in (ii) Zn act as reducing agent (reduce Ag ⁺ to Ag ).

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