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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Zone refining is used for the purification of

Copper sulphate is prepared by blowing a current of air through copper scrap and dilute $H_2SO_4$. Dilute $HNO_3$ is also added:

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Match the following:
List-$I$ (Process)List-$II$ (Metal)
$A$. Hall-Heroult process$I$. $Ti$
$B$. Mond process$II$. $In$
$C$. van-Arkel process$III$. $Al$
$D$. Zone refining process$IV$. $Ni$

The correct answer is:

The anode mud in the electrolytic refining of silver contains

During the purification of metals by the $Van-Arkel$ method,the metal is converted into $......$.

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