Cryolite is .........

  • A
    $Na_3AlF_6$ and is used to decrease the electrical conductivity in the electrolysis of alumina.
  • B
    $Na_3AlF_6$ and is used to decrease the melting point of alumina in the electrolysis of alumina.
  • C
    $Na_3AlF_6$ and is used for the electrolytic refining of alumina.
  • D
    $Na_3AlF_6$ and is used in the electrolysis of alumina.

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An ore of metal $'M'$ $\xrightarrow{\text{Roasting}}$ Metal oxide $\xrightarrow{\text{carbon reduction}}$ $'M'$
(After crushing and grinding)
$'M'$ may be :-

$I$. $FeCr_2O_4 + NaOH + \text{air} \rightarrow (A) + Fe_2O_3$
$II$. $(A) + (B) \rightarrow Na_2Cr_2O_7$
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$IV$. $Cr_2O_3 + Y \xrightarrow{\Delta} Cr$
High temperature $(> 1000 \ ^\circ C)$ electrolytic reduction is necessary for isolating:

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