When silica is present as an impurity in an ore,a/an ........ flux is required.

Although thermodynamically feasible,in practice,magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why?

The incorrect statement about the Hall$-$Heroult process is:

Flux is used to remove

Which of the following reaction$(s)$ do(es) not occur in Bessemer's converter?

Name the metal $M$ which is extracted on the basis of following reactions:
$4M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^{-} + 4OH^{-}$
$2[M(CN)_2]^{-} + Zn \rightarrow [Zn(CN)_4]^{2-} + 2M$