Which method of refining nickel is represented by the following equation?
$Ni$ (impure) $+ 4CO$ $\xrightarrow{320 \ K} Ni(CO)_4$ $\xrightarrow{420 \ K} Ni$ (pure) $+ 4CO$

  • A
    Cupellation
  • B
    Mond process
  • C
    Van Arkel method
  • D
    Zone refining

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