Select the incorrect statement.

Spiegeleisen is an alloy of

Refractory materials are generally used in furnaces because

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.
$(i)$ $Cu$ metal is extracted from its sulphide ore by reduction of $Cu_2O$ with $FeS$.
$(ii)$ An ore of Tin containing $FeCrO_4$ is concentrated by magnetic separation method.
$(iii)$ Auto reduction process is used in the extraction of $Cu$ & $Hg$.
$(iv)$ Cassiterite and Rutile are oxide ores of the metals.

Which of the following is not a basic flux?

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Concentration of gold ore	$I$. Aniline
$B$. Leaching of alumina	$II$. $NaOH$
$C$. Froth stabiliser	$III$. $SO_2$
$D$. Blister copper	$IV$. $NaCN$

Choose the correct answer from the options given below.