JEE Main Chemistry question

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

Not in JEE Main or NEET syllabus

Gold is extracted by hydrometallurgical process, based on its property

(A)Of being electropositive
(B)Of being less reactiveCorrect
(C)To form complexes which are water soluble
(D)To form salts which are water soluble

Answer: (B)

Solution

Gold's extremely low reactivity means it does not readily oxidise/dissolve under ordinary conditions, so it must be deliberately brought into solution as a soluble complex using a mild complexing + oxidising system (dilute cyanide + air):

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Question ID VK-147203