Which of the following statements is correct?

  • A
    In the Castner process for the extraction of sodium metal,$NaCl$ is used as an electrolyte.
  • B
    Sodium metal reduces $CO_2$ to carbon.
  • C
    Magnesium reacts with cold water and releases hydrogen.
  • D
    Magnalium is an alloy of $Mg$ and $Zn$.

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