One of the constituents of German silver is:

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.

Which of the following statements is not correct?

Which of the following statements is correct?

Read the following statements :
$(I)$ $Al$ has greater affinity than that of $Cr$ for oxygen
$(II)$ $Al$ can be used for reduction of $Fe_2O_3$
$(III)$ Carbon is used for reduction of $PbO$
$(IV)$ $SnO_2$ can be reduced by carbon
Choose the correct set of statement$(s)$:

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