JEE Advanced Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Advanced

Not in JEE Main or NEET syllabus

Extraction of Ag from sulphide ore and removal of unreacted silver from photographic plate involve complexes

(A) in both
(B) in both
(C),
(D), Correct

Answer: (D)

Solution

Silver sulphide ore is extracted via the cyanide process: Ag_2S + CN^- \rightarrow [Ag(CN)_2]^-. Unreacted silver (as ) is removed from exposed photographic film/plate during "fixing" using sodium thiosulfate ("hypo"):

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Question ID VK-160049