To obtain steel entirely free from sulphur and phosphorus,the process used is

Consider the following:
Statement-$I$ : In the extraction of $Al$ by Hall-Heroult process,pure $Al_2O_3$ mixed with $Na_3AlF_6$ lowers its melting point and increases conductivity.
Statement-$II$ : Zirconium metal is purified by zone refining method.

Which of the following is an incorrect match?

Identify the alloy containing a non-metal as a constituent in it.

Type metal is an alloy of $Pb, Sb$ and $Sn$. It consists of

What is Thomas slag?