Which of the following is incorrectly matched?

  • A
    Polling - Purification of $Cu$
  • B
    Cupellation - Purification of $Ag$
  • C
    Smelting - Oxidation process
  • D
    Roasting - Oxidation process

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In the leaching of $Ag_2S$ with $NaCN$,a stream of air is also passed. This is because of:

In the leaching of $Ag_2S$ with $NaCN$,a stream of air is also passed. It is because of

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