In the metallurgical process of aluminium,cryolite $(Na_3AlF_6)$ is mixed with alumina $(Al_2O_3)$ in its molten state,because it

  • A
    decreases the amount of alumina
  • B
    oxidises the alumina
  • C
    increases the melting point of alumina
  • D
    decreases the melting point of alumina

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