Match List-$I$ with List-$II$:

List-$I$ (Property)	List-$II$ (Element/compound)
$I$. Explosive	$A$. $Cu$
$II$. Self-reduction	$B$. $Fe_3O_4$
$III$. Magnetic material	$C$. $Cu(CH_3COO)_2 \cdot Cu(OH)_2$
$IV$. Verdigris	$D$. $Pb(NO_3)_2$

Write the uses of alloys.

Which of the following changes involve more than two metallurgical processes?

For the following statements,mark $T$ for true and $F$ for false statement.
Statement $1$: $SnO_2 +$ wolframite,in this $SnO_2$ is magnetic while wolframite is non-magnetic in nature.
Statement $2$: Argentite ore is concentrated by froth floatation method.
Statement $3$: Copper and lead ores are reduced by self-reduction method.
Statement $4$: In metallurgy of $Fe$,$CO$ is used as a reducing agent at low temperature.

Concentrated sodium hydroxide can separate a mixture of

The percentage of silver in 'German silver' is: