Chemistry-
General
Easy

Question

Gold is extracted by hydrometallurgical process based on its property

  1. (a) Of being electropositive  
  2. Of being less reactive  
  3. (c) To form complexes which are water soluble   
  4. To form salts which are water soluble  

The correct answer is: (c) To form complexes which are water soluble


    Hydrometallurgy is the process of dissolving the metal or its ore by the action of a suitable chemical regent followed by recovery of the metal either by electrolysis or by the use of a suitable precipitating agent.
    4 A u plus 8 K C N plus 2 H subscript 2 end subscript O plus stack O subscript 2 end subscript with text air end text below rightwards arrow 4 K left square bracket A u left parenthesis C N right parenthesis subscript 2 end subscript right square bracket plus 4 K O H
    2 K left square bracket A u left parenthesis C N right parenthesis subscript 2 end subscript right square bracket plus Z n rightwards arrow 2 A u plus K subscript 2 end subscript left square bracket Z n left parenthesis C N right parenthesis subscript 4 end subscript right square bracket

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