The inner layer of a blast furnace is made of:

$FeCr_2O_4$ (chromite) is converted to $Cr$ by following steps:
Chromite $\xrightarrow{I} Na_2CrO_4$ $\xrightarrow{II} Cr_2O_3$ $\xrightarrow{III} Cr$
Reagents in $I, II$ and $III$ steps might be:
$I$ Step $-$ $II$ Step $-$ $III$ Step

Which metals are extracted using the self-reduction method?

After froth flotation,copper sulfide is reduced by.........

Among the following,an example of the thermite process is:

Which is the most impure form of iron?